22056-53-7 5-21-07-00456 (Beilstein Handbook Reference) BRN 1448129 KETONE, METHYL 1,4,5,6-TETRAHYDRO-2-METHYLCYCLOPENTA(b)PYRROL-3-YL Methyl 1,4,5,6-tetrahydro-2-methylcyclopenta(b)pyrrol-3-yl ketone