Elevated dihydrotestosterone (DHT), arising from the reduction of testosterone through the action of steroid 5a-reductase, has been implicated in a number of conditions including benign prostatic hyperplasia (BPH), l acne? hirs~ tism,~ and androgenic alopecia (male- pattern baldne~ s).~ A number of compounds have been identified as inhibitors of 5a- reductase, including both steroidal inhibitors, MK-W6 (1, Proscar, finasteride) and SKF ...