1-Pyrrolidinecarboxylic acid, 2-(8-chloroimidazo[1,5-a]pyrazin-3-yl)-, phenylmethyl ester, (2S); (S)-Benzyl 2-(8-chloroimidazo[1,5-a]pyrazin-3-yl)pyrrolidine-1-carboxylate; Phenylmethyl(2S)-2-(8-chloroimidazo[1,5-a]pyrazin-3-yl)-1-pyrrolidinecarboxylate ;