1-(3,6-dihydro-2H-pyridin-1-ylmethyl)pyrrolidin-2-one

1-[[but-3-enyl-[(2-oxopyrrolidin-1-yl)methyl]amino]methyl]pyrrolidin-2-one

1-[(2-oxopyrrolidin-1-yl)-phenylmethyl]pyrrolidin-2-one

1-(2-methylprop-1-enyl)pyrrolidin-2-one

1-(2-azido-4-methylbenzoyl)pyrrolidin-2-one