| 摘要 |
A compound represented by the following general formula (I) or a salt thereof:wherein R<alpha> represents a C1-C10 alkyl group, a C3-C10 alkenyl group, a C7-C15 aralkyl group, a quinolinylalkyl group, a quinolinylalkenyl group, a C2-C10 alkylcarbonyl group, a C7-C15 aralkylcarbonyl group, a C4-C7 cycloalkylcarbonyl group, benzoyl group, an imidazolylcarbonyl group and the like; R<1 >represents hydrogen atom, a C1-C10 alkyl group, or a C2-C10 alkylcarbonyl group; and R<2 >represents hydrogen atom, a C1-C10 alkyl group, or a C2-C10 alkylcarbonyl group, provided that the compound wherein R<alpha> represents a C2-C10 alkylcarbonyl group and both of R<1 >and R<2 >represent a C1-C10 alkyl group is excluded.
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