"Exemestane does not bind significantly to steroidal receptors,
except for a slight affinity for the androgen receptor (0.28% relative to dihydrotestosterone).
The binding affinity of its 17-dihydrometabolite for the androgen receptor, however, is 100-
times that of the parent compound."
Dihydrotestosterone is DHT. DHT binds with higher affinity to androgen receptors than regular testosterone.
My Apologies people I found the info here:
"In vivo studies of aromatase inactivation indicate that exemestane, by the oral route, is several times more potent than formestane and suppresses plasma oestrogen by approximately 98% compared with baseline 46. Exemestane has no noteworthy binding to oestrogen, progesterone, glucocorticoid or mineralocorticoid receptors
and only a very low binding to the androgen receptor (Relative Binding Affinity, RBA, 0.2% from that of dihydrotestosterone, DHT) 47.
- However, its metabolite FCE 25071 (17-hydro-exemestane) was found to have a binding affinity to the androgen receptor (100-fold higher than that of exemestane (RBA 27% from and 0.28% that of DHT, respectively)