Atosiban Impurity 2

Chemical Name: (2S)-N-((S)-5-amino-1-((2-amino-2-oxoethyl)amino)-1-oxopentan-2-yl)-1-((4R,7S,10S,16R)-7-(2-amino-2-oxoethyl)-13-((S)-sec-butyl)-16-(4-ethoxybenzyl)-10-((R)-1-hydroxyethyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentaazacycloicosane-4-carbonyl)pyrrolidine-2-carboxamide

Smile: O=C([C@H](CSSCCC(N[C@@H](C1=O)CC2=CC=C(OCC)C=C2)=O)NC([C@@H](NC([C@](NC(C(N1)[C@@H](C)CC)=O)([H])[C@H](O)C)=O)CC(N)=O)=O)N(CCC3)[C@@H]3C(N[C@@H](CCCN)C(NCC(N)=O)=O)=O