1-methyl-3,4-dihydro-2H-pyrrol-1-ium 1-methyl-1-pyrrolin-1-ium 16032-02-3 1-Methylpyrrolinium C06178 1-Methyl-delta(1)-pyrrolinium 2H-Pyrrolium, 3,4-dihydro-1-methyl- N-Methylpyrrolinium 1-methyl-3,4-dihydro-2H-pyrrolium CHEBI:27435