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多肽

肽是由两个或两个以上氨基酸通过脱水缩合形成的化合物。最简单的肽由两个氨基酸构成,称为二肽;包含多个氨基酸的肽则被称为多肽。通常情况下,含有50个及以上氨基酸单位的多肽,则归类为蛋白质。肽广泛存在于动物、植物和微生物中,在生物体内的生长发育、细胞分化、大脑活动、肿瘤病变、免疫防御、生殖控制以及抗衰老等方面都扮演着重要角色。

例如,谷胱甘肽是某些酶的重要辅基,参与体内氧化还原反应;多种激素如催产素、加压素、胰高血糖素及促肾上腺皮质激素等,均属于多肽类,通过调节机体代谢发挥作用。下丘脑分泌的激素调节因子也是由多肽构成,控制着其他内分泌腺释放激素的过程。

近年来,在高等动物的大脑中发现了具有镇痛作用的脑啡肽(五肽)。许多抗生素如多粘菌素、短杆菌肽等也是肽类物质,具备强大的抗菌能力。此外,多肽是指通过肽键连接形成的一系列氨基酸单位构成的长链结构。一般而言,含有数十个或更少氨基酸单位的多肽称为肽;而更多氨基酸单位组成的则被称为蛋白质。

在命名时,通常按照从氨基末端(N端)到羧基末端(C端)的顺序书写。如Ser·Gly·Try·Ala·Leu这个五肽由5个氨基酸残基和4个肽键组成,命名为丝氨酰甘氨酰酪氨酰丙氨酰亮氨酸。

肽广泛存在于动植物组织中,并且其中许多具有特殊生物活性的功能性肽统称为生物活性肽。近年来的研究表明,几乎所有重大生命科学理论——包括免疫防御、生殖控制、肿瘤病变和抗衰防老等——均涉及相关的活性肽,这些理论与临床医学实践密切相关,因此生物活性肽在实际应用中也具有重要价值。

生物活性肽种类繁多,例如促肾上腺皮质激素为39肽,催产素为九肽,而两种重要的脑啡肽均为五肽。许多抗菌素也是由肽类物质构成的。生长因子则受控于基因,在细胞发育过程中起到调节和控制作用。表皮生长因子含有50个氨基酸残基,神经生长因子则由118个氨基酸组成。

中文名称 英文名称 CAS号 化学式 结构式图片
—— 4-[[2-[[2-(1-amino-2-methylbutyl)-4,5-dihydro-1,3-thiazole-4-carbonyl]amino]-3-methylpentanoyl]amino]-5-[[1-[[3-(2-amino-2-oxoethyl)-18-(3-aminopropyl)-12-benzyl-6-(carboxymethyl)-9-(1H-imidazol-5-ylmethyl)-15-(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclopentacos-21-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoic acid —— C66H103N17O16S
4-[[2-[[2-(1-amino-2-methylbutyl)-4,5-dihydro-1,3-thiazole-4-carbonyl]amino]-3-methylpentanoyl]amino]-5-[[1-[[3-(2-amino-2-oxoethyl)-18-(3-aminopropyl)-12-benzyl-6-(carboxymethyl)-9-(1H-imidazol-5-ylmethyl)-15-(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclopentacos-21-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoic acid
—— (3S,6R,11R,14S,23S,26S,29S,32S)-6-[[(2S)-2-aminopropanoyl]amino]-23-(carboxymethyl)-26-(hydroxymethyl)-29-(1H-indol-3-ylmethyl)-3-(2-methylpropyl)-2,5,13,19,22,25,28,31-octaoxo-8,9-dithia-1,4,12,18,21,24,27,30-octazatricyclo[30.3.0.014,18]pentatriacontane-11-carboxylic acid —— C45H63N11O14S2
(3S,6R,11R,14S,23S,26S,29S,32S)-6-[[(2S)-2-aminopropanoyl]amino]-23-(carboxymethyl)-26-(hydroxymethyl)-29-(1H-indol-3-ylmethyl)-3-(2-methylpropyl)-2,5,13,19,22,25,28,31-octaoxo-8,9-dithia-1,4,12,18,21,24,27,30-octazatricyclo[30.3.0.014,18]pentatriacontane-11-carboxylic acid
—— H-Ala-Gly-Ser-Val-Glu-Gln-Thr(PO3H2)-Pro-Lys-Lys-OH —— C44H78N13O19P
H-Ala-Gly-Ser-Val-Glu-Gln-Thr(PO3H2)-Pro-Lys-Lys-OH
—— H-Ala-Pro-Gln-Pro-Ala-Pro-Glu-Asn-Ala-Tyr-OH —— C47H68N12O16
H-Ala-Pro-Gln-Pro-Ala-Pro-Glu-Asn-Ala-Tyr-OH
—— H-Gln-Pro-Pro-Val-Pro-Pro-Gln-Arg-Pro-Met-OH —— C51H83N15O13S
H-Gln-Pro-Pro-Val-Pro-Pro-Gln-Arg-Pro-Met-OH
—— (4S)-4-[[(2S)-2-[[(2S,3R)-2-[[(2S)-3-carboxy-2-[[(2S)-1-[(2S)-3-carboxy-2-[[(2S)-2,4-diamino-4-oxobutanoyl]amino]propanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-3-phosphonooxybutanoyl]amino]-4-methylpentanoyl]amino]-5-[[(2S,3S)-1-[[(2S)-1-[[(1S)-1-carboxy-2-hydroxyethyl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoic acid —— C50H76N11O24P
(4S)-4-[[(2S)-2-[[(2S,3R)-2-[[(2S)-3-carboxy-2-[[(2S)-1-[(2S)-3-carboxy-2-[[(2S)-2,4-diamino-4-oxobutanoyl]amino]propanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-3-phosphonooxybutanoyl]amino]-4-methylpentanoyl]amino]-5-[[(2S,3S)-1-[[(2S)-1-[[(1S)-1-carboxy-2-hydroxyethyl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoic acid
—— neurokinin B 86933-75-7 C55H79N13O14S2
neurokinin B
—— H-DL-Pyr-DL-His-DL-Trp-DL-Ser-DL-Tyr-Gly-DL-Leu-DL-Arg-DL-Pro-Gly-NH2.2HCl —— C55H77Cl2N17O13
H-DL-Pyr-DL-His-DL-Trp-DL-Ser-DL-Tyr-Gly-DL-Leu-DL-Arg-DL-Pro-Gly-NH2.2HCl
—— N-Acetyl-L-alpha-aspartyl-L-alpha-glutamyl-beta-phenyl-L-phenylalanyl-L-alloisoleucyl-3-cyclohexyl-L-alanyl-L-cysteinyl-D-prolyl-L-norleucyl-L-alpha-aspartyl-L-valinamide —— C64H93N11O17S
N-Acetyl-L-alpha-aspartyl-L-alpha-glutamyl-beta-phenyl-L-phenylalanyl-L-alloisoleucyl-3-cyclohexyl-L-alanyl-L-cysteinyl-D-prolyl-L-norleucyl-L-alpha-aspartyl-L-valinamide
—— N-Acetyl-L-alpha-aspartyl-L-alpha-glutamyl-beta-phenyl-L-phenylalanyl-L-alloisoleucyl-3-cyclohexyl-L-alanyl-L-cysteinyl-D-prolyl-3-cyclohexyl-L-alanyl-L-alpha-aspartyl-L-valinamide —— C67H97N11O17S
N-Acetyl-L-alpha-aspartyl-L-alpha-glutamyl-beta-phenyl-L-phenylalanyl-L-alloisoleucyl-3-cyclohexyl-L-alanyl-L-cysteinyl-D-prolyl-3-cyclohexyl-L-alanyl-L-alpha-aspartyl-L-valinamide
—— NH2-Glu-Ser-Glu-Leu-Val-Ser-Gln-Ile-Ile-Glu-Gln-Leu-Ile-Lys-Lys-COOH —— C78H137N19O26
NH2-Glu-Ser-Glu-Leu-Val-Ser-Gln-Ile-Ile-Glu-Gln-Leu-Ile-Lys-Lys-COOH
—— NH2-Ser-Asn-Gln-Gly-Gly-Ser-Pro-Leu-Pro-Ser-Val-COOH —— C49H83N17O18
NH2-Ser-Asn-Gln-Gly-Gly-Ser-Pro-Leu-Pro-Ser-Val-COOH
—— NH2-Leu-Pro-Leu-Pro-Ala-Pro-Ser-Phe-His-Arg-Thr-Thr-COOH —— C62H97N17O16
NH2-Leu-Pro-Leu-Pro-Ala-Pro-Ser-Phe-His-Arg-Thr-Thr-COOH
—— NH2-Lys-Pro-Lys-Gln-Ile-Lys-Pro-Pro-Leu-Pro-Ser-Val-COOH —— C63H110N16O15
NH2-Lys-Pro-Lys-Gln-Ile-Lys-Pro-Pro-Leu-Pro-Ser-Val-COOH
—— D-LysD-LysD-ValD-ValD-PheD-LysD-ValD-LysD-PheD-LysD-Lys —— C69H119N17O12
D-LysD-LysD-ValD-ValD-PheD-LysD-ValD-LysD-PheD-LysD-Lys
—— Kkvvfkvkfkk —— C69H119N17O12
Kkvvfkvkfkk
—— Cbz-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-OtBu —— C56H93N11O14
Cbz-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-Aib-OtBu
—— Boc-DL-Ala-Aib-DL-Ala-Aib-DL-Ala-DL-Glu(OBn)-DL-Ala-Aib-DL-Ala-Aib-DL-Ala-OMe —— C52H83N11O16
Boc-DL-Ala-Aib-DL-Ala-Aib-DL-Ala-DL-Glu(OBn)-DL-Ala-Aib-DL-Ala-Aib-DL-Ala-OMe
—— Substance P (2-11) —— C57H86N14O12S
Substance P (2-11)
—— H-DL-Ala-DL-Pro-Gly-DL-Asp-DL-Arg-DL-xiIle-DL-Tyr-DL-Val-DL-His-DL-Pro-DL-Phe-OH —— C60H86N16O15
H-DL-Ala-DL-Pro-Gly-DL-Asp-DL-Arg-DL-xiIle-DL-Tyr-DL-Val-DL-His-DL-Pro-DL-Phe-OH
—— Pyr-his-trp-ser-tyr-D-lys-leu-arg-pro-gly-NH2 52671-12-2 C59H84N18O13
Pyr-his-trp-ser-tyr-D-lys-leu-arg-pro-gly-NH2
—— Cys-Gly-Tyr-Gly-Pro-Lys-Lys-Lys-Arg-Lys-Val-Gly-Gly —— C60H104N20O15S
Cys-Gly-Tyr-Gly-Pro-Lys-Lys-Lys-Arg-Lys-Val-Gly-Gly
—— Syntide-2, Protein Kinase Substrate —— C68H122N20O18
Syntide-2, Protein Kinase Substrate
—— H-DL-Pro-DL-Lys-DL-Lys-DL-Lys-DL-Arg-DL-Lys-DL-Val-DL-Glu-DL-Asp-DL-Pro-DL-Tyr-DL-Cys-OH —— C66H111N19O18S
H-DL-Pro-DL-Lys-DL-Lys-DL-Lys-DL-Arg-DL-Lys-DL-Val-DL-Glu-DL-Asp-DL-Pro-DL-Tyr-DL-Cys-OH
—— Levitide, >=97% (HPLC) —— C66H119N21O19S
Levitide, >=97% (HPLC)
—— [Ser2]-Neuromedin C —— C49H72N16O11S
[Ser2]-Neuromedin C
—— [Arg8]-Vasotocin-Gly-Lys-Arg, >=97% (HPLC) —— C57H93N21O16S2
[Arg8]-Vasotocin-Gly-Lys-Arg, >=97% (HPLC)
—— H-DL-Cys(1)-DL-Tyr-DL-xiIle-DL-Gln-DL-Asn-DL-Cys(1)-DL-Pro-DL-Arg-Gly-Gly-OH —— C45H69N15O14S2
H-DL-Cys(1)-DL-Tyr-DL-xiIle-DL-Gln-DL-Asn-DL-Cys(1)-DL-Pro-DL-Arg-Gly-Gly-OH
—— 2-[[2-[[6-Amino-2-[[6-amino-2-[[2-[[2-[2-[[2-[[2-[(2-amino-3-methyl-butanoyl)amino]-3-methyl-butanoyl]amino]-5-guanidino-pentanoyl]amino]propanoylamino]acetyl]amino]-3-methyl-butanoyl]amino]hexanoyl]amino]hexanoyl]amino]-3-hydroxy-propanoyl]amino]-4-methyl-pentanoic acid —— C47H89N15O12
2-[[2-[[6-Amino-2-[[6-amino-2-[[2-[[2-[2-[[2-[[2-[(2-amino-3-methyl-butanoyl)amino]-3-methyl-butanoyl]amino]-5-guanidino-pentanoyl]amino]propanoylamino]acetyl]amino]-3-methyl-butanoyl]amino]hexanoyl]amino]hexanoyl]amino]-3-hydroxy-propanoyl]amino]-4-methyl-pentanoic acid
—— Methyl 4-[2-[2-[2-[2-[2-[2-[[2-[2-[2-[(4-bromobenzoyl)amino]propanoylamino]propanoylamino]-2-methylpropanoyl]amino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]-4,7,10-trimethyl-5,8,11-trioxo-2-oxa-6,9,12-triazatricyclo[11.6.2.016,20]henicosa-1(19),16(20),17-triene-13-carboxylate —— C57H80BrN13O16
Methyl 4-[2-[2-[2-[2-[2-[2-[[2-[2-[2-[(4-bromobenzoyl)amino]propanoylamino]propanoylamino]-2-methylpropanoyl]amino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]propanoylamino]-4,7,10-trimethyl-5,8,11-trioxo-2-oxa-6,9,12-triazatricyclo[11.6.2.016,20]henicosa-1(19),16(20),17-triene-13-carboxylate
—— H-DL-xiIle-DL-Val-DL-Pro-DL-Phe-DL-Leu-Gly-DL-Pro-DL-Leu-DL-Leu-Gly-DL-Leu-DL-Leu-DL-xiThr-NH2 —— C68H114N14O14
H-DL-xiIle-DL-Val-DL-Pro-DL-Phe-DL-Leu-Gly-DL-Pro-DL-Leu-DL-Leu-Gly-DL-Leu-DL-Leu-DL-xiThr-NH2
—— Pyr-his-trp-ser-tyr-D-ala-leu-arg-pro-gly-NH2 —— C56H77N17O13
Pyr-his-trp-ser-tyr-D-ala-leu-arg-pro-gly-NH2
—— Angiotensin I, human —— C62H89N17O14
Angiotensin I, human
—— Substance P, 11-L-methionine-, methyl ester —— C64H99N17O14S
Substance P, 11-L-methionine-, methyl ester
—— Ser-ala-alloresact —— C42H71N13O14S2
Ser-ala-alloresact
—— H-DL-Asp-DL-Arg-DL-Val-DL-Tyr-DL-Val-DL-His-DL-Pro-DL-Phe-DL-His-DL-Leu-OH —— C61H87N17O14
H-DL-Asp-DL-Arg-DL-Val-DL-Tyr-DL-Val-DL-His-DL-Pro-DL-Phe-DL-His-DL-Leu-OH
—— H-DL-Pyr-DL-His-DL-Trp-DL-Ser-DL-Tyr-Gly-DL-Leu-DL-Arg-DL-Pro-Gly-OH —— C55H74N16O14
H-DL-Pyr-DL-His-DL-Trp-DL-Ser-DL-Tyr-Gly-DL-Leu-DL-Arg-DL-Pro-Gly-OH
—— H-Val-Glu-Asp-Tyr-Glu-Gln-Gly-Leu-Ser-Gly-OH —— C46H69N11O20
H-Val-Glu-Asp-Tyr-Glu-Gln-Gly-Leu-Ser-Gly-OH
—— H-Arg-His-Arg-Lys(Me)-Val-Leu-Arg-Asp-Asn-Tyr-OH —— C59H99N23O15
H-Arg-His-Arg-Lys(Me)-Val-Leu-Arg-Asp-Asn-Tyr-OH
—— H-Lys-Arg-Trp-Ile-Ile-Leu-Gly-Leu-Asn-Lys-OH —— C59H101N17O12
H-Lys-Arg-Trp-Ile-Ile-Leu-Gly-Leu-Asn-Lys-OH
—— H-Ser-Ser-Leu-Glu-Asn-Phe-Arg-Ala-Tyr-Val-OH —— C53H80N14O17
H-Ser-Ser-Leu-Glu-Asn-Phe-Arg-Ala-Tyr-Val-OH
—— (4S)-4-[[(2S)-1-[(2S)-2-[[(2S)-2-[(2-aminoacetyl)amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-carboxy-propanoyl]pyrrolidine-2-carbonyl]amino]-5-[[(1S,2R)-1-[[2-[[(1S,2R)-1-[[(1S)-2-(carboxymethylamino)-1-(1H-indol-3-ylmethyl)-2-oxo-ethyl]carbamoyl]-2-hydroxy-propyl]amino]-2-oxo-ethyl]carbamoyl]-2-hydroxy-propyl]amino]-5-oxo-pentanoic acid —— C48H63N11O18
(4S)-4-[[(2S)-1-[(2S)-2-[[(2S)-2-[(2-aminoacetyl)amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-carboxy-propanoyl]pyrrolidine-2-carbonyl]amino]-5-[[(1S,2R)-1-[[2-[[(1S,2R)-1-[[(1S)-2-(carboxymethylamino)-1-(1H-indol-3-ylmethyl)-2-oxo-ethyl]carbamoyl]-2-hydroxy-propyl]amino]-2-oxo-ethyl]carbamoyl]-2-hydroxy-propyl]amino]-5-oxo-pentanoic acid
—— 2-[[(2S)-2-[[(2S,3R)-2-[[(2S)-2-[[(2S)-1-[(2S)-1-[(2S)-1-[(2S)-1-[(2S,3R)-2-[(2-aminoacetyl)amino]-3-hydroxybutanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-hydroxybutanoyl]amino]-3-methylbutanoyl]amino]acetic acid —— C46H68N10O14
2-[[(2S)-2-[[(2S,3R)-2-[[(2S)-2-[[(2S)-1-[(2S)-1-[(2S)-1-[(2S)-1-[(2S,3R)-2-[(2-aminoacetyl)amino]-3-hydroxybutanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-hydroxybutanoyl]amino]-3-methylbutanoyl]amino]acetic acid
—— (2S)-2-[[(2S,3S)-2-[[2-[[2-[[(2S)-2-[[(2S)-2-[[2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]acetyl]amino]-3-carboxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-methylpentanoyl]amino]hexanoic acid —— C51H70N12O15
(2S)-2-[[(2S,3S)-2-[[2-[[2-[[(2S)-2-[[(2S)-2-[[2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]acetyl]amino]-3-carboxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-methylpentanoyl]amino]hexanoic acid
—— (3S)-3-[[(2S)-2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-4-[[(2S)-1-[[2-[[2-[[(2S,3S)-1-[[(1S)-1-carboxyethyl]amino]-3-methyl-1-oxopentan-2-yl]amino]-2-oxoethyl]amino]-2-oxoethyl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-4-oxobutanoic acid —— C49H66N12O15
(3S)-3-[[(2S)-2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-4-[[(2S)-1-[[2-[[2-[[(2S,3S)-1-[[(1S)-1-carboxyethyl]amino]-3-methyl-1-oxopentan-2-yl]amino]-2-oxoethyl]amino]-2-oxoethyl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-4-oxobutanoic acid
—— (2S)-6-amino-2-[[(2S,3S)-2-[[2-[[2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-3-carboxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-methylpentanoyl]amino]hexanoic acid —— C52H73N13O15
(2S)-6-amino-2-[[(2S,3S)-2-[[2-[[2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-1-[(2S)-4-amino-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-4-oxobutanoyl]pyrrolidine-2-carbonyl]amino]propanoyl]amino]-3-carboxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-methylpentanoyl]amino]hexanoic acid
—— des-Tyr1-gamma-Endorphin —— C74H122N18O25S
des-Tyr1-gamma-Endorphin
—— Arg-Pro-Lys-Pro-Gln-Gln-Phe-Phe-Gly-Leu-Nle-NH2 —— C64H100N18O13
Arg-Pro-Lys-Pro-Gln-Gln-Phe-Phe-Gly-Leu-Nle-NH2
—— 4-[[2-[[2-(1-amino-2-methylbutyl)-4,5-dihydro-1,3-thiazole-4-carbonyl]amino]-4-methylpentanoyl]amino]-5-[[1-[[3-(2-amino-2-oxoethyl)-18-(3-aminopropyl)-12-benzyl-15-butan-2-yl-6-(carboxylatomethyl)-9-(1H-imidazol-5-ylmethyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclopentacos-21-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoate —— C66H101N17O16S-2
4-[[2-[[2-(1-amino-2-methylbutyl)-4,5-dihydro-1,3-thiazole-4-carbonyl]amino]-4-methylpentanoyl]amino]-5-[[1-[[3-(2-amino-2-oxoethyl)-18-(3-aminopropyl)-12-benzyl-15-butan-2-yl-6-(carboxylatomethyl)-9-(1H-imidazol-5-ylmethyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclopentacos-21-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-5-oxopentanoate
—— H-DL-Asn-DL-Pro-DL-Asn-DL-Ala-DL-Asn-DL-Pro-DL-Asn-DL-Ala-DL-Asn-DL-Pro-DL-Asn-DL-Ala-OH —— C48H74N18O19
H-DL-Asn-DL-Pro-DL-Asn-DL-Ala-DL-Asn-DL-Pro-DL-Asn-DL-Ala-DL-Asn-DL-Pro-DL-Asn-DL-Ala-OH