The crystal structure of the antihypertensive and cardiovascular protective
ramipril {systematic name: 1-[2-(1-ethoxycarbonyl-3-phenylpropylamino)prop
ionyl]octahydrocyclo-penta[b]pyrrole-2-carboxylic acid}, C23H32N2O5, has be
en determined. Within the crystal structure, strong hydrogen bonds connect
the molecules into chains along the [100] direction. The preferred crystal
growth along these chains causes a crystal morphology of very thin needles
which previously prevented the crystal structure determination.