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中文名称 英文名称 CAS号 化学式 结构式图片
—— 1-[4-(2-Acetyl-3,4,5-trimethoxyphenoxy)-3,5-dimethoxyphenyl]ethanone —— C21H24O8
1-[4-(2-Acetyl-3,4,5-trimethoxyphenoxy)-3,5-dimethoxyphenyl]ethanone
—— [(1S,19S,21R,22S,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate —— C27H22O18
[(1S,19S,21R,22S,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate
—— [(1S,19S,21S,22S,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate —— C27H22O18
[(1S,19S,21S,22S,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate
—— [(1S,19S,21S,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate —— C27H22O18
[(1S,19S,21S,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate
—— galloyl(-3)[galloyl(-6)]Man(b)-O-galloyl —— C27H24O18
galloyl(-3)[galloyl(-6)]Man(b)-O-galloyl
—— (9S,10S)-3,4,5,14,15,16-hexamethoxy-9,10-dimethyltricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-9,10-diol —— C24H32O8
(9S,10S)-3,4,5,14,15,16-hexamethoxy-9,10-dimethyltricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-9,10-diol
—— (9R,10R)-3,4,5,14,15,16-hexamethoxy-9,10-dimethyltricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-9,10-diol —— C24H32O8
(9R,10R)-3,4,5,14,15,16-hexamethoxy-9,10-dimethyltricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-9,10-diol
—— [(1S,19S,21R,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate —— C27H22O18
[(1S,19S,21R,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate
—— [(1R,8S,9R,18R,19S,21R,22S)-7,7,8,12,13,22-hexahydroxy-21-(hydroxymethyl)-3,6,16-trioxo-2,17,20,23-tetraoxapentacyclo[16.3.1.18,11.04,9.010,15]tricosa-4,10,12,14-tetraen-19-yl] 3,4,5-trihydroxybenzoate —— C27H22O19
[(1R,8S,9R,18R,19S,21R,22S)-7,7,8,12,13,22-hexahydroxy-21-(hydroxymethyl)-3,6,16-trioxo-2,17,20,23-tetraoxapentacyclo[16.3.1.18,11.04,9.010,15]tricosa-4,10,12,14-tetraen-19-yl] 3,4,5-trihydroxybenzoate
—— [4-Acetyl-3-[4,5-diacetyloxy-6-(acetyloxymethyl)-3-hydroxyoxan-2-yl]oxy-5-hydroxyphenyl] benzoate —— C27H28O13
[4-Acetyl-3-[4,5-diacetyloxy-6-(acetyloxymethyl)-3-hydroxyoxan-2-yl]oxy-5-hydroxyphenyl] benzoate
—— [4-Acetyl-3-[3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyphenyl] benzoate —— C29H30O13
[4-Acetyl-3-[3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyphenyl] benzoate
—— [3-Hydroxy-2-[3-(4-nitrophenyl)propanoyl]-5-[3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyphenyl] benzoate —— C36H35NO16
[3-Hydroxy-2-[3-(4-nitrophenyl)propanoyl]-5-[3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyphenyl] benzoate
—— [(2S,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] 3,4,5-trimethoxybenzoate —— C16H22O10
[(2S,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] 3,4,5-trimethoxybenzoate
—— 3-methoxy-4-[(2S,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid —— C14H18O9
3-methoxy-4-[(2S,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid
—— 3-methoxy-4-[(2R,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid —— C14H18O9
3-methoxy-4-[(2R,3S,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid
—— 3-methoxy-4-[(2R,3S,4R,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid —— C14H18O9
3-methoxy-4-[(2R,3S,4R,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid
—— 3-methoxy-4-[(2S,3R,4R,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid —— C14H18O9
3-methoxy-4-[(2S,3R,4R,5S,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoic acid
—— [(1R,19S,21S,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate —— C27H22O18
[(1R,19S,21S,22R,23R)-6,7,8,11,12,13,22,23-octahydroxy-3,16-dioxo-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-21-yl] 3,4,5-trihydroxybenzoate
—— 6-Bromo-4-[6-bromo-7-methoxy-5-(2-pyrrolidin-1-ylethylamino)oxycarbonyl-1,3-benzodioxol-4-yl]-7-methoxy-1,3-benzodioxole-5-carboxylic acid —— C24H24Br2N2O10
6-Bromo-4-[6-bromo-7-methoxy-5-(2-pyrrolidin-1-ylethylamino)oxycarbonyl-1,3-benzodioxol-4-yl]-7-methoxy-1,3-benzodioxole-5-carboxylic acid
—— [(8S,9S,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate —— C30H32O9
[(8S,9S,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate
—— [(8R,9S,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate —— C30H32O9
[(8R,9S,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate
—— 3,4,5,11,12,13,21,22,23,26,30,35,39-tridecahydroxy-9,14,17,29,36-pentaoxaoctacyclo[29.8.0.02,7.010,15.019,24.025,34.028,33.032,37]nonatriaconta-1(39),2,4,6,19,21,23,25,28(33),30,32(37),34-dodecaene-8,18,27,38-tetrone —— C34H22O22
3,4,5,11,12,13,21,22,23,26,30,35,39-tridecahydroxy-9,14,17,29,36-pentaoxaoctacyclo[29.8.0.02,7.010,15.019,24.025,34.028,33.032,37]nonatriaconta-1(39),2,4,6,19,21,23,25,28(33),30,32(37),34-dodecaene-8,18,27,38-tetrone
—— 2-Bromo-1-(4-bromo-2,6-dimethoxyphenoxy)-3,4,5-trimethoxybenzene;5-bromo-1,3-dimethoxy-2-(3,4,5-trimethoxyphenoxy)benzene —— C34H37Br3O12
2-Bromo-1-(4-bromo-2,6-dimethoxyphenoxy)-3,4,5-trimethoxybenzene;5-bromo-1,3-dimethoxy-2-(3,4,5-trimethoxyphenoxy)benzene
—— [(8S,9R,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate —— C30H32O9
[(8S,9R,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate
—— [(8R,9R,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate —— C30H32O9
[(8R,9R,10R)-9-hydroxy-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-8-yl] benzoate
—— (Z)-3-methyl-1-[(9R,10R,11R)-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-11-yl]pent-3-en-2-one —— C29H36O7
(Z)-3-methyl-1-[(9R,10R,11R)-3,4,5,19-tetramethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-11-yl]pent-3-en-2-one
—— 3,14,15,16-Tetramethoxytricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-4,5-diol —— C20H24O6
3,14,15,16-Tetramethoxytricyclo[10.4.0.02,7]hexadeca-1(16),2,4,6,12,14-hexaene-4,5-diol
—— Hernandesine —— C39H46N2O7
Hernandesine
—— 6-(5-Carboxy-2-hydroxyphenoxy)-3,4,5-trihydroxyoxane-2-carboxylic acid —— C13H14O10
6-(5-Carboxy-2-hydroxyphenoxy)-3,4,5-trihydroxyoxane-2-carboxylic acid
—— [(1R)-18,19-dimethoxy-13,14-dimethyl-20-oxo-3,6,8-trioxapentacyclo[9.9.1.01,16.04,21.05,9]henicosa-4(21),5(9),10,16,18-pentaen-12-yl] (E)-2-methylbut-2-enoate —— C27H30O8
[(1R)-18,19-dimethoxy-13,14-dimethyl-20-oxo-3,6,8-trioxapentacyclo[9.9.1.01,16.04,21.05,9]henicosa-4(21),5(9),10,16,18-pentaen-12-yl] (E)-2-methylbut-2-enoate
—— (2S,3S,4S,5R,6S)-6-(5-ethoxycarbonyl-2-hydroxyphenoxy)-3,4,5-trihydroxyoxane-2-carboxylic acid —— C15H18O10
(2S,3S,4S,5R,6S)-6-(5-ethoxycarbonyl-2-hydroxyphenoxy)-3,4,5-trihydroxyoxane-2-carboxylic acid
—— [2-hydroxy-3-sulfonatooxy-5-[[(2R,3R,4S,5R,6S)-3,4,5,6-tetrakis[(4-hydroxy-3,5-disulfonatooxybenzoyl)oxy]oxan-2-yl]methoxycarbonyl]phenyl] sulfate —— C41H22O56S10-10
[2-hydroxy-3-sulfonatooxy-5-[[(2R,3R,4S,5R,6S)-3,4,5,6-tetrakis[(4-hydroxy-3,5-disulfonatooxybenzoyl)oxy]oxan-2-yl]methoxycarbonyl]phenyl] sulfate
—— 4-Hydroxy-3-methoxyphenol 1-O-(6-O-syringoyl)glucoside —— C22H26O12
4-Hydroxy-3-methoxyphenol 1-O-(6-O-syringoyl)glucoside
—— [(2R,3R,4R,5S,6S)-2-[[(2R,3R,4S,5R,6S)-6-[2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxochromen-3-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methoxy]-3,5-dihydroxy-6-methyloxan-4-yl] 4-hydroxy-3,5-dimethoxybenzoate —— C36H38O20
[(2R,3R,4R,5S,6S)-2-[[(2R,3R,4S,5R,6S)-6-[2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxochromen-3-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methoxy]-3,5-dihydroxy-6-methyloxan-4-yl] 4-hydroxy-3,5-dimethoxybenzoate
—— 2,3,7,8-Tetrakis[(trimethylsilyl)oxy]chromeno[5,4,3-cde]chromene-5,10-dione —— C26H38O8Si4
2,3,7,8-Tetrakis[(trimethylsilyl)oxy]chromeno[5,4,3-cde]chromene-5,10-dione
—— 2,6,13,14-Tetrahydroxy-12-methoxy-3,5,10,17-tetraoxapentacyclo[9.6.2.02,6.08,18.015,19]nonadeca-1(18),7,11,13,15(19)-pentaene-9,16-dione —— C16H10O11
2,6,13,14-Tetrahydroxy-12-methoxy-3,5,10,17-tetraoxapentacyclo[9.6.2.02,6.08,18.015,19]nonadeca-1(18),7,11,13,15(19)-pentaene-9,16-dione
—— [(3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2,3-bis(3,4,5-trihydroxybenzoyl)-2-(3,4,5-trihydroxybenzoyl)oxyoxan-3-yl] 3,4,5-trihydroxybenzoate —— C34H28O22
[(3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2,3-bis(3,4,5-trihydroxybenzoyl)-2-(3,4,5-trihydroxybenzoyl)oxyoxan-3-yl] 3,4,5-trihydroxybenzoate
—— 3-[3-[[[4-[(3-Chloro-2,4,5,6-tetrahydroxyphenyl)-hydroxymethyl]-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C24H23ClN2O19
3-[3-[[[4-[(3-Chloro-2,4,5,6-tetrahydroxyphenyl)-hydroxymethyl]-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid
—— 3-[3-[2-[[2-(3-Chlorophenyl)-1,1,2-trihydroxyethyl]amino]ethylamino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C23H23ClN2O13
3-[3-[2-[[2-(3-Chlorophenyl)-1,1,2-trihydroxyethyl]amino]ethylamino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid
—— 12-Hydroxy-3,4,5,8,9,17,21-heptaoxaheptacyclo[12.6.2.02,6.07,19.010,12.010,16.015,20]docosa-13,15-diene-18,22-dione —— C15H10O10
12-Hydroxy-3,4,5,8,9,17,21-heptaoxaheptacyclo[12.6.2.02,6.07,19.010,12.010,16.015,20]docosa-13,15-diene-18,22-dione
—— 6,7-dihydroxy-14-methylperoxy-13-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,9-dioxatetracyclo[6.6.2.04,16.011,15]hexadeca-1(15),4,6,8(16),11,13-hexaene-3,10-dione —— C21H18O14
6,7-dihydroxy-14-methylperoxy-13-[(3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-2,9-dioxatetracyclo[6.6.2.04,16.011,15]hexadeca-1(15),4,6,8(16),11,13-hexaene-3,10-dione
—— (6aS)-3-[4-[4-(2,5-dihydro-1,2-oxazol-5-yl)-2,6-dimethoxy-3-(2,3,4-trimethoxyphenyl)phenoxy]butoxy]-2-methoxy-6a,7,8,9-tetrahydropyrrolo[2,1-c][1,4]benzodiazepin-11-one —— C37H43N3O10
(6aS)-3-[4-[4-(2,5-dihydro-1,2-oxazol-5-yl)-2,6-dimethoxy-3-(2,3,4-trimethoxyphenyl)phenoxy]butoxy]-2-methoxy-6a,7,8,9-tetrahydropyrrolo[2,1-c][1,4]benzodiazepin-11-one
—— 3-[3-[[2-[[2-(3-Chlorophenyl)-2-methoxyethyl]amino]-1,1-dihydroxyethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C24H25ClN2O13
3-[3-[[2-[[2-(3-Chlorophenyl)-2-methoxyethyl]amino]-1,1-dihydroxyethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid
—— [8-Acetyl-11,12,13-trihydroxy-3,6,16-trioxo-21,22-bis[(3,4,5-trihydroxybenzoyl)oxy]-2,7,17,20-tetraoxatetracyclo[16.3.1.04,9.010,15]docosa-4,8,10,12,14-pentaen-19-yl]methyl 3,4,5-trihydroxybenzoate —— C42H30O26
[8-Acetyl-11,12,13-trihydroxy-3,6,16-trioxo-21,22-bis[(3,4,5-trihydroxybenzoyl)oxy]-2,7,17,20-tetraoxatetracyclo[16.3.1.04,9.010,15]docosa-4,8,10,12,14-pentaen-19-yl]methyl 3,4,5-trihydroxybenzoate
—— gomisin B —— C28H34O9
gomisin B
—— 3-[3-[[2-[[2-(3-Chloro-2,4,5,6-tetrahydroxyphenyl)-2-hydroxyethyl]amino]-2,2-dihydroxyethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C23H23ClN2O17
3-[3-[[2-[[2-(3-Chloro-2,4,5,6-tetrahydroxyphenyl)-2-hydroxyethyl]amino]-2,2-dihydroxyethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid
—— 3-[3-[[[4-[(3-Chlorophenyl)-hydroxymethyl]-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C24H23ClN2O15
3-[3-[[[4-[(3-Chlorophenyl)-hydroxymethyl]-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid
—— ethyl 4-hydroxy-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoate —— C15H20O9
ethyl 4-hydroxy-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxybenzoate
—— (10R,11R,29R)-3,4,5,16,17,18,21,22,23,29,36,37,38-tridecahydroxy-9,12,27,30,33-pentaoxaheptacyclo[33.3.1.02,7.010,31.011,28.014,19.020,25]nonatriaconta-1(39),2,4,6,14,16,18,20,22,24,35,37-dodecaene-8,13,26,34-tetrone —— C34H24O22
(10R,11R,29R)-3,4,5,16,17,18,21,22,23,29,36,37,38-tridecahydroxy-9,12,27,30,33-pentaoxaheptacyclo[33.3.1.02,7.010,31.011,28.014,19.020,25]nonatriaconta-1(39),2,4,6,14,16,18,20,22,24,35,37-dodecaene-8,13,26,34-tetrone
—— 3-[3-[[[4-(2-Chloro-3,4,5-trihydroxy-8-methyl-7-bicyclo[4.2.0]octa-1(6),2,4-trienyl)-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid —— C26H25ClN2O17
3-[3-[[[4-(2-Chloro-3,4,5-trihydroxy-8-methyl-7-bicyclo[4.2.0]octa-1(6),2,4-trienyl)-2,4-dihydroxyazetidin-2-yl]-dihydroxymethyl]amino]-2,4,5,6-tetrahydroxyphenyl]-2,4,5,6-tetrahydroxybenzoic acid