Derivatives (mostly of natural origin) of the linear furocoumarin skeleton, psoralen,
or its angular
isomer, angelicin, variously substituted with hydroxy, methoxy, alkyl, or hydroxymethyl
groups, among others.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1337