A pharmaceutical formulation comprising 5-methoxy psoralen, which is useful in the treatment of psoriasis and other skin disorders, is disclosed herein. 5-methoxy psoralen may be synthesized from phloroglucinol by a five step process which is also disclosed.
This is a division of application Ser. No. 07/879,539, filed May 4, 1992, now U.S. Pat. No. 5,360,816, which in turn is a continuation of application Ser. No. 07/749,491, filed Aug. 15, 1991, now abandoned, which in turn is a continuation of Ser. No. 07/352,705, filed May 10, 1989, now abandoned, which in turn is a continuation of Ser. No. 07/201,384, filed May 31, 1988, now abandoned, which in turn is a continuation of Ser. No. 06/825,783, filed Feb. 3, 1986, now abandoned, which in turn is a continuation of Ser. No. 06/724,496, filed Apr. 18, 1985, now abandoned, which is a continuation of Ser. No. 06/547,914, filed Nov. 2, 1983, now abandoned, which in turn is a divisional of Ser. No. 06/195,414, filed Oct. 9, 1980, now U.S. Pat. No. 4,429,138, which in turn is a continuation of Ser. No. 05/953, 118, filed Oct. 20, 1978, now abandoned.
