A compound of Formula I: (I) has activity as a cannabinoid receptor antagonist. In Formula 1, R1 is unsubstituted or substituted aryl, unsubstituted or substituted cycloalkyl, unsubstituted or substituted heterocyclyl, unsubstituted or substituted aralkyl, or unsubstituted or substituted heteroaryl R2 is unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or unsubstituted or substituted heteroaryl and R3 is unsubstituted or substituted alkyl, unsubstituted or substituted aralkyl, or unsubstituted or substituted heteroaralkyl with the proviso that at least one of Ri and R3 is other than unsubstituted aralkyl or R2 is other than unsubstituted aryl.
