Patent ID: 8901139

Claim:
A compound having the formula: and pharmaceutically acceptable salts thereof, wherein the dotted line represents an optional and additional bond, and wherein: R 1 is -alkylene-OC(O)-alkyl or aminoalkyl; R 2 is H, F, Cl or —CH 3 ; R 3 is phenyl, naphthyl, nitrogen-containing heterocycloalkyl, nitrogen-containing heterocycloalkenyl or nitrogen-containing heteroaryl, any of which can be optionally substituted with up to 3 groups, which can be the same or different, and are selected from methyl, t-butyl, allyl, F, Cl, Br, —CN, —O—CH 2 CH 3 , —S(O)CH 3 , —S(O) 2 CH 3 , —NH 2 , —OH, —CH 2 NH 2 , —C(O)NH 2 , —C(O)NHCH 3 , —C(O)NH-cyclopropyl, hydroxyalkyl, —C(O)H, —C(O)CH 3 , —C(O)O-isopropyl, —C(O)O-t-butyl, —CH 2 C(O)-t-butyl, —OCH 3 , —NHCH 3 , —SCH 3 , —C(O)NHCH 3 , —NHC(O)OCH 3 , —NHC(O)O-isopropyl, —CH 2 N(CH 3 ) 2 , —OC(O)CH(CH 3 )NHC(O)O-t-butyl, —OC(O)CH(CH 3 )NH 2 , —C(O)O-t-butyl, —CH 2 C(O)O-t-butyl, —OCH 2 CH 2 N(CH 3 ) 2 , morpholinyl, —CH 2 OC(O)-t-butyl, —CH(═NOH), —CH(═NOCH 3 ), —NHC(O)CH 2 N(CH 3 ) 2 and —NHC(O)O-t-butyl.