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Introduction. An isomer is an excited quantum-mechanical state of a nucleus, in which a combination of nuclear structure effects inhibits its decay and endows the...
A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons). "Metastable" refers to the...
Optical isomerism is a form of stereoisomerism. This page explains what stereoisomers are and how you recognise the possibility of optical isomers in a molecule.
Dextropropoxyphene  is an analgesic in the opioid category, patented in 1955  and manufactured by Eli Lilly and Company. It is an optical isomer of levopropoxyphene