Matulane (procarbazine hydrochloride), a hydrazine derivative antineoplastic agent, is available as capsules containing the equivalent of 50 mg procarbazine as the hydrochloride. Each capsule also contains cornstarch, mannitol and talc. Gelatin capsule shells contain parabens (methyl and propyl), potassium sorbate, titanium dioxide, FD&C Yellow No. 6 and D&C Yellow No. 10.