4-Desacetylvinblastine hydrazide 55383-37-4 Deacetylvinblastine hydrazide Desacetylvinblastine hydrazide O(sup 4)-Deacetyl-vincaleukoblastin-23-oic acid hydrazide Vincaleukoblastin-23-oic acid, O(sup 4)-deacetyl-, hydrazide