| abstract |
Disclosed is a compound represented by the following general formula (I). (I) (In the formula, R1 represents a hydrogen atom or the like; R2 and R3 independently represent a hydrogen atom, an optionally oxidized C1-C4 alkyl group or an optionally protected hydroxy group, or alternatively R2 and R3 may combine together to form an optionally oxidized C2-C5 alkylene group; R4 represents an optionally oxidized C1-C6 alkyl group or the like; R5 represents an optionally oxidized C1-C6 alkyl group or the like; R6 represents an optionally oxidized C1-C6 alkyl group or the like; m represents 0 or an integer of 1-3; n represents 0 or an integer of 1-4; and i represents 0 or an integer of 1-7.) |