<unk>  (also called<unk> e) is the parent compound in a family of natural products known as furocoumarins. It is structurally related to coumarin by the addition of a fused furan ring, and may be considered as a derivative of umbelliferone.<unk>  occurs naturally in the seeds of<unk>  corylifolia, as well as in the common fig, celery, parsley and West Indian satinwood. It is widely used in PUVA (=<unk>  + UVA) treatment for<unk> riasis, eczema,  vitiligo, and cutaneous T-cell lymphoma.  Many furocoumarins are extremely toxic to fish, and some are deposited in streams in Indonesia to catch fish.
Psoralen
Etretinate
Halobetasol
Bitolterol
Bilastine
Bioallethrin
Ecallantide
Olaflur