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    中文名称 英文名称 CAS号 化学式
    2alpha-甲基环丁酮 2-methylcyclobutanone 1517-15-3 C5H8O
    2alpha-甲基-9alpha-氟皮质醇 9α-Fluor-2α-methylcortisol 432-34-8 C22H31FO5
    2alpha-溴-3-[(4-硝基苯氧基)亚氨基]-5alpha-雄甾烷-17-酮 2-alpha-Bromo-5-alpha-androstane-3,17-dione 3-(O-(p-nitrophenyl)oxime) 51354-35-9 C25H31BrN2O4
    2alpha-溴-17beta-羟基-5alpha-雄甾烷-3-酮O-(4-硝基苯基)肟 2-alpha-Bromo-17-beta-hydroxy-5-alpha-androstan-3-one O-(p-nitrophenyl)oxime 51354-34-8 C25H33BrN2O4
    2alpha-氯-3-[(4-硝基苯氧基)亚氨基]-5alpha-雄甾烷-17-酮 2-alpha-Chloro-5-alpha-androstane-3,17-dione 3-(O-(p-nitrophenyl)oxime) 51354-33-7 C25H31ClN2O4
    2alpha-(3,4-二甲氧基苯基)-5,7-二甲氧基-3,4-二氢-2H-1-苯并吡喃-3beta-醇 (2R,3S)-(+)-catechin 3',4',5,7-tetramethyl ether 51079-25-5 C19H22O6
    2alpha,7beta-二氢-4-甲氧基-2alpha,7beta-二甲基-1,2-二氧四环并[3,4-b]苯并呋喃 2a,7b-Dihydro-4-methoxy-2a,7b-dimethyl-1,2-dioxeto(3,4-b)benzofuran 128753-88-8 C11H12O4
    2alpha,3beta-[[(3aR,4S,7aR)-7,7alpha-二氢-4H-1,3-二氧杂环戊并[4,5-c]吡喃-3a,4(6H)-二基]二(氧基)]-11alpha,14-二羟基-12-氧代心甾-4,20(22)-二烯内酯 Elaeodendroside A 64144-98-5 C29H36O10
    2alpha,3beta,4beta-三羟基-2,3,4,4abeta,5,6-六氢[1,3]二氧杂环戊并[4,5-j]菲啶-6-酮 lycoricidine 19622-83-4 C14H13NO6
    2alpha,3beta,20beta-乌苏-delta12-烯-23beta,28-二酸2,3-二乙酸酯 2alpha,3beta,20beta-Urs-delta 12-ene-23beta,28-dioic acid 2,3-diacetate 79679-46-2 C34H50O8
    2alpha,3alpha,19alpha,23-四羟基乌苏-12-烯-28-酸 myrianthic acid 89786-84-5 C30H48O6
    2alpha,14-二羟基-12-甲氧基苦树-12-烯-1,11,16-三酮 picrasin G 35598-69-7 C21H28O7
    2aH-环丁二烯并[e]茚-2a,7-二醇,1,2,3,4,4a,7,7a,7b-八氢-7a-(羟甲基)-2,2,4a-三甲基-,(2aS,4aR,7R,7aR,7bR)-(9CI) punctaporonin E 106673-28-3 C15H24O3
    2a-甲基-4-孕烯-3,20-二酮 2α-Methylprogesteron 2636-91-1 C22H32O2
    2a-(b-D-吡喃葡萄糖基氧基)-12-甲氧基苦树-12-烯-1,11,16-三酮 Picrasinoside A 83543-82-2 C27H38O11
    2a,8b-二氢-环戊二烯并[cd]薁 Tricyclo<5.4.1.0<sup>4,12</sup>>dodeca-2.5.7.9.11(1)-pentaen 38310-40-6 C12H10
    2a,7b-二甲基-2a,7b-二氢[1,2]二噁丁并[3,4-b][1]苯并呋喃-6-基乙酸酯 6-Acetoxy-2a,7b-dihydro-2a,7b-dimethyl-1,2-dioxeto<3,4-b>benzofuran 128753-91-3 C12H12O5
    2a,7b-二氢-7b-甲氧基-2a-甲基-1,2-二氧四环并(3,4-b)苯并呋喃 2a,7b-Dihydro-7b-methoxy-2a-methyl-1,2-dioxeto (3,4-b)benzofuran 128753-82-2 C10H10O4
    2a,7b-二氢-7b-甲基-1,2-二氧四环并(3,4-b)苯并呋喃 2a,7b-Dihydro-7b-methyl-1,2-dioxeto(3,4-b)benzofuran 128753-83-3 C9H8O3
    2a,7b-二氢-7-甲氧基-2a,7b-二甲基-1,2-二氧四环并(3,4-b)苯并呋喃 2a,7b-Dihydro-7-methoxy-2a,7b-dimethyl-1,2-dioxeto(3,4-b)benzofuran 128753-87-7 C11H12O4
    2a,4a,6a-三氮杂-6b-磷酰环戊烷 hexahydro-2a,4a,6a-triaza-6b-phospha-cyclopenta[<i>cd</i>]pentalene 6b-oxide 71771-37-4 C6H12N3OP
    2a,3a,16a,17a-双环氧雄甾-17b-羟基 5a-醋酸酯 2α,3α:16α,17α-diepoxy-17β-acetoxy-5α-androstane 50588-22-2 C21H30O4
    2a,3,5,6,11a,11b-六氢-3-羟基-2a,6,10-三甲基-3-(1-甲基丙基)-6,9-环氧-2H-1,4-二氧杂环癸[cd]并环戊二烯-2,7(4ah)-二酮 Eremantholide B 69883-96-1 C20H26O6
    2a,3,4,5-四氢苯并[Cd]吲哚-2(1H)-酮 tetrahydrobenzindole 96933-21-0 C11H11NO
    2a,3,4,5-四氢苊 1,2,2a,3,4,5-hexahydro-acenaphthylene 480-72-8 C12H14
    2a,3,3a,5a,6,6a,6b,6c-八氢-二环戊烷并(cd,gh)并环戊二烯 Dodecahydrodicyclopenta[cd,gh]pentalene 60606-96-4 C12H18
    2a,2b,4a,4b-四氢-环丙并(cd)并环戊二烯 semibullvalene 6909-37-1 C8H8
    2a,2b,4a,4b-四氢-1-氮杂环丙烷[Cd]戊搭烯-2(1H)-酮 2a,2b,4a,4b-Tetrahydro-1H-1-aza-cyclopropa[cd]pentalen-2-one 87986-10-5 C7H7NO
    2`,4-二羟基-3`,4`,6`-三甲氧基查尔酮 2',4-hydroxy-3',4',6'-trimethoxychalcone 69616-74-6 C18H18O6
    2`,3`-二氯-6`-氟苯乙酮 1-(2,3-Dichloro-6-fluorophenyl)ethanone 870704-16-8 C8H5Cl2FO
    2S，2'S）-2-（（（2-氨基-6-氧代-1H-嘌呤-9（6H）-基）甲氧基）丙烷-1,3-二基双（2-（（（（苄氧基）羰基）氨基）-3-甲基丁酸） CBZ-protected bis L-valyl ester of ganciclovir 130914-77-1 C35H43N7O10
    2S-苄氧羰酰氨基-4-氧代-丁酸苄酯 benzyl (2S)-2-{[(benzyloxy)carbonyl]amino}-4-oxobutanoate 58578-45-3 C19H19NO5
    2S-氧氯吡格雷(盐酸盐) 2-Oxoclopidogrel 1147350-75-1 C16H16ClNO3S
    2S-t-丁基二甲基硅烷基氧基-3R-(t-叔丁氧羰基)-氨基-1,4-二氯丁烷 2(S)-t-butyldimethylsilyloxy-3(R)-(t-butyloxycarbonyl)amino-1,4-dichlorobutane 326480-00-6 C15H31Cl2NO3Si
    2S-[2[1(R*),2R*,4R*],4]]-3-[4-叠氮-2-异丙基-1-氧代-4-[四氢-4-异丙基-5-氧代-2-呋喃基]丁基]-4-苄基-2-噁唑烷酮 (S)-3-((2S,4S)-4-azido-2-isopropyl-4-((2S,4S)-4-isopropyl-5-oxotetrahydrofuran-2-yl)butanoyl)-4-benzyloxazolidin-2-one 173154-01-3 C24H32N4O5
    2S-N-Cbz-高丝氨酸二环己胺盐 dicyclohexylammonium (2S)-2-(benzyloxycarbonylamino)-4-hydroxybutyrate 58578-43-1 C12H15NO5*C12H23N
    2S,4S)-2-[5-[1,11-二氢-2-[(2S,5S)-1-[(2S)-2-[(甲氧羰基)氨基]-3-甲基-1-氧代丁基]-5-甲基-2-吡咯烷基][2]苯并吡喃并[4',3':6,7]萘并[1,2-d]咪唑-9-基]-1H-咪唑-2-基]-4-(甲氧基甲基)-1-吡咯烷羧酸叔丁酯 tert-butyl (2S,4S)-2-[5-(2-{(2S,5S)-1-[N-(methoxycarbonyl)-L-valyl]-5-methylpyrrolidin-2-yl}-1,11-dihydroisochromeno[4',3':6,7]naphtho[1,2-d]imidazol-9-yl)-1H-imidazol-2-yl]-4-(methoxymethyl)pyrrolidine-1-carboxylate 1378391-45-7 C44H53N7O7
    2S,3S-2-甲基-哌啶-3-甲酸 (2S,3S)-2-methyl-piperidine-3-carboxylic acid —— C7H13NO2
    2S,3S,5S-2-氨基-5-[N-[[(5-噻唑基)甲氧基]羰基]氨基]-1,6-二苯基-3-羟基己烷 (2S,3S,5S)-2-amino-5-<N-<<(5-thiazolyl)methoxy>carbonyl>amino>-1,6-diphenyl-3-hydroxyhexane 144164-10-3 C23H27N3O3S
    2S,3R-双(羟甲基)哌啶 2S,3R-bis(hydroxymethyl)piperidine 1034128-98-7 C7H15NO2
    2RS,4RS)-4-溴-2-(2,4-二氯苯基)四氢糠基)-1H-1,2,4-三唑 Bromuconazole 116255-48-2 C13H12BrCl2N3O
    2R-羟基-4-甲基戊酰基-R-缬氨酸 2R-hydroxy-4-methylvaleryl-R-valine 1133318-13-4 C11H21NO4
    2R-(t-叔丁氧羰基)氨基-1,4-二氯-3S-羟基丁烷 2(R)-((tert-butyloxycarbonyl)amino)-1,4-dichloro-3(S)-hydroxybutane 326479-99-6 C9H17Cl2NO3
    2R)-2-叔丁氧基-4-(9-芴甲氧基)羧氨基丁酸 4-(9H-fluoren-9-ylmethoxycarbonylamino)-2-[(2-methylpropan-2-yl)oxy]butanoic acid 905857-50-3 C23H27NO5
    2R)-(+)-3,3'-二苯基-[2,2'-联二萘]-1,1'-二醇 (S)-vanol 147702-14-5 C32H22O2
    2H，3H-七氟己酸 3-(Perfluoropropyl)-2-propenoic acid 356-03-6 C6H3F7O2
    2H噻嗪 2H-1,2-thiazine 289-85-0 C4H5NS
    2H-螺[苯并呋喃-3,4-哌啶]-2-酮盐酸盐 2H-spiro[benzofuran-3,4’-piperidine]-2-one hydrochloride 481001-07-4 C12H13NO2*ClH
    2H-螺[环戊烷-1,4'-吡啶并[2,3-d][1,3]恶嗪]-2-酮 spiro<cyclopentane-1,4'-1H-pyrido<2',3'-d><1',3'>oxazin>-2'-one 122503-73-5 C11H12N2O2
    2H-螺[异喹啉-1,4’-哌啶]-3(4H)-酮 3-oxo-3,4-dihydrospiro<isoquinoline-1(2H),4'-piperidine> 15142-87-7 C13H16N2O