Methyl 1,4,5,6-tetrahydro-2-methylcyclopenta(b)pyrrol-3-yl ketone (CAS NO.22056-53-7) is also called 5-21-07-00456 (Beilstein Handbook Reference) ; BRN 1448129 ; Ketone, methyl 1,4,5,6-tetrahydro-2-methylcyclopenta(b)pyrrol-3-yl .