Prodrug compounds, process for the preparation thereof and sustained release preparation comprising the same

摘要

The invention relates to a novel prodrug compound useful in the treatment of tumors, of the formula: A-CO(CH2)m(NHCO)n-R wherein A is a residue of an antitumor substance having >NH or -NH2 group in the molecule, R is a residue of cholesterol, m is an integer of 1 or 2 and n is 0 or 1, and its salts.