81571-34-8 Ethyl N-(O-4-deacetyl-vinblastin-23-oyl)-L-tryptophanate V-Trp-E Vincaleukoblastine, O(sup 4)-deacetyl-3-de(methoxycarbonyl)-3-(((2-ethoxy-1-(1H-indol-3-ylmethyl)-2-oxoethyl)amino)carbonyl)-, (3(R))-