spiro[2.2]pentane-1-carboxylic acid
N-<(R)-1'-phenyl-2'-hydroxyethyl>-(1S)-methylenecyclopropanecarboxamide
N-<(R)-1'-phenyl-2'-hydroxyethyl>-(1R)-methylenecyclopropanecarboxamide
diphenyl (2-oxo-2-methylenecyclopropyl)ethylphosphonate
(2-hydroxymethyl)methylenecyclopropane