Patent ID: 8575197

Claim:
A compound represented by the formula (I′): wherein Z 1 ′ is optionally protected hydroxy or optionally protected mercapto; Z 2 ′ is 0; t′ is an integer of 0; R 4a ′ and R 4b ′ are each independently hydrogen or lower alkyl; m′ and n′ are each independently an integer of 0 to 2; Ring A′ is cycloalkane, cycloalkene, an aromatic carbocyclic ring or a heterocyclic ring; B′ is cycloalkane-diyl, cycloalkene-diyl, aromatic carbocyclic ring-diyl or heterocyclic ring-diyl, or; when n′ is 0, B′ may be methylthio, is methylthio, trifluoromethylthio, or —C(R 7a ′)═N—O—R 7b ′; R 7a ′ and R 7b ′ are each independently hydrogen or substituted or unsubstituted lower alkyl; R 1a ′ and R 1b ′ are each independently halogen, hydroxy, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkenyl, substituted or unsubstituted lower alkynyl, substituted or unsubstituted lower alkoxy, substituted or unsubstituted lower alkylthio, substituted or unsubstituted acyl, carboxy, substituted or unsubstituted lower alkoxycarbonyl, substituted or unsubstituted carbamoyl, substituted or unsubstituted amino, substituted or unsubstituted sulfamoyl, cyano, or nitro; R 2 ′ is substituted or unsubstituted tert-butyl, or substituted or unsubstituted i-propyl; R 3 ′ is a group represented by the formula: wherein Y′ is —O—, —S—, or —NR 9 ′—; R 9 ′ is hydrogen or lower alkyl; Z′ is hydroxy, substituted or unsubstituted lower alkoxy, substituted or unsubstituted lower alkylthio, substituted or unsubstituted acyl, carboxy, substituted or unsubstituted lower alkoxycarbonyl, substituted or unsubstituted carbamoyl, substituted or unsubstituted amino, substituted or unsubstituted lower alkylsulfinyl, substituted or unsubstituted alkylsulfamoyl or cyano; R 8a ′ and R 8b ′ are each independently hydrogen or substituted or unsubstituted lower alkyl; s′ is an integer of 1 to 4, or its pharmaceutically acceptable salt thereof.