8-Ethyl Irinotecan

Irinotecan Impurity G;
[1,4 inverted exclamation mark-Bipiperidine]-1 inverted exclamation mark-carboxylic Acid (4S)-4,8,11-Triethyl-3,4,12,14-tetrahydro-4-hydroxy-3,14-dioxo-1H-pyrano[3 inverted exclamation mark,4 inverted exclamation mark :6,7]indolizino[1,2-b]quinolin-9-yl Ester;