普卡那肽

   Plecanatide是一种可模拟胃肠液体调节肽效应的新药， 据Philip B. Miner博士介绍，该项多中心随机试验纳入的951例患者中，21.5%接受plecanatide 3 mg/d的患者在12周中至少9周对治疗应答，相比之下安慰剂组这一比例为11.5%（P=0.003）。此外，治疗组患者治疗最后4周中的3周期间持久应答者比例（指有利的应答）为19%，安慰剂组为10.7%（P=0.009）。

       Plecanatide是一种鸟苷酸环化酶C（GC-C）受体激动剂，效应与利尿钠肽尿鸟苷素相似，可诱导液体分泌进入胃肠道，从而增加胃肠动力。

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(2S)-2-[[(1R,4S,7S,10S,13S,16R,21R,27S,34R,37S,40S)-10-(2-amino-2-oxoethyl)-34-[[(2S)-4-carboxy-2-[[(2S)-3-carboxy-2-[[(2S)-2,4-diamino-4-oxobutanoyl]amino]propanoyl]amino]butanoyl]amino]-37-(2-carboxyethyl)-27-[(1R)-1-hydroxyethyl]-4-methyl-40-(2-methylpropyl)-3,6,9,12,15,23,26,29,35,38,41-undecaoxo-7,13-di(propan-2-yl)-18,19,31,32-tetrathia-2,5,8,11,14,22,25,28,36,39,42-undecazabicyclo[14.13.13]dotetracontane-21-carbonyl]amino]-4-methylpentanoic acid
L-Leucine, L-asparaginyl-L-alpha-aspartyl-L-alpha-glutamyl-L-cysteinyl-L-alpha-glutamyl-L-leucyl-L- cysteinyl-L-valyl-L-asparaginyl-L-valyl-L-alanyl-L-cysteinyl-L-threonylglycyl-L-cysteinyl-, cyclic (4->12),(7->15)-bis(disulfide)
L-Asparaginyl-L-α-aspartyl-N-{(1R,4S,7S,10S,13S,16R,19S,22S,25R,32S,38R)-10-(2-amino-2-oxoethyl)-22-(2-carboxyethyl)-38-{[(1S)-1-carboxy-3-methylbutyl]carbamoyl}-32-[(1R)-1-hydroxyethyl]-19-isobut yl-7,13-diisopropyl-4-methyl-3,6,9,12,15,18,21,24,30,33,36-undecaoxo-27,28,40,41-tetrathia-2,5,8,11,14,17,20,23,31,34,37-undecaazabicyclo[14.13.13]dotetracont-25-yl}-L-α-glutamine