Zosurabalpin Ethyl ester impurity

Chemical Name: ethyl 4-((7S,10S,13S)-13-((1H-indol-3-yl)methyl)-10-(4-aminobutyl)-7-(3-aminopropyl)-12-methyl-8,11,14-trioxo-5,6,7,8,9,10,11,12,13,14,15,16-dodecahydrobenzo[b]pyrido[3,2-p][1]thia[5,8,11,14]tetraazacycloheptadecin-17-yl)benzoate

Smile: O=C([C@H](CC1=CNC2=C1C=CC=C2)N(C)C([C@H](CCCCN)N3)=O)NCC4=C(C5=CC=C(C(OCC)=O)C=C5)C=CC=C4SC6=NC=CC=C6CN[C@@H](CCCN)C3=O