prov:value
| - The compound according to claim 13, wherein R4 is a hydrogen atom and R5 is a phenyl-lower alkoxycarbonyl, a lower alkanoyl, a phenyl-lower alkanoyl, a cycloalkyl-lower alkanoyl wherein said cycloalkyl group has 3 to 8 carbon atoms, a cycloalkylcarbonyl wherein said cycloalkyl group has 3 to 8 carbon atoms, tricyclo(3.3.1.1)decanylcarbonyl, naphthylcarbonyl, pyridylcarbonyl, furoyl, thenoyl, a phe
|