| abstract |
Compound of formula (I): ** Formula ** or a pharmaceutically acceptable salt thereof, wherein: R1 is hydrogen, R2 is hydrogen, R3 is difluoromethyl, methoxymethyl or ethoxymethyl, R3 is hydrogen, R4 is selected from hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted carbocyclyl, substituted or unsubstituted heterocyclyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, each of R6a and R6b is hydrogen , each of R11a and R11b is hydrogen, and in which ------ represents a single or double bond, provided that, in the event that a double bond is present, one of R6a or R6b It is absent, and in the event that a single bond is present in Ring B, the hydrogen in C5 is in the alpha or beta position. |