- Analgesic, antimuscarinic activity and enantioselectivity of the four isomers of 3-quinuclidinyl tropate as compared with the enantiomers of hyoscyamine. Dei, S., Bellucci, C., Gualtieri, F., Romanelli, M.N., Scapecchi, S., Teodori, E., Bartolini, A., Ghelardini, C. Farmaco (1995)