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HYDROLYSIS OF IRINOTECAN AND ITS OXIDATIVE METABOLITES, 7-ETHYL-10-[4-N-(5-AMINOPENTANOIC ACID)-1-PIPERIDINO] CARBONYLOXYCAMPTOTHECIN AND 7-ETHYL-10-[4-(1-PIPERIDINO)-1-AMINO]-CARBONYLOXYCAMPTOTHECIN, BY HUMAN CARBOXYLESTERASES CES1A1, CES2, AND A NEWLY EXPRESSED CARBOXYLESTERASE ISOENZYME, CES3