Synonyms: 4a,10a-Epoxy-1H-naphtho[2,3-c]pyran-3-aceticacid, 3,4,5,10-tetrahydro-9-hydroxy-5,10-dioxo-1-propyl-, [1R-(1a,3b,4ab,10ab)]-;4a,10a-Epoxy-1H-naphtho[2,3-c]pyran-3-acetic acid, 3b,4,5,10-tetrahydro-9-hydroxy-5,10-dioxo-1b-propyl- (8CI); Frenolicin (7CI)