| http://www.w3.org/ns/prov#value | - 1, ##STR30## wherein each of R1, R3 and R5 is a hydrogen atom or methyl group, R4 is a tert-butyl group, R6 is an acid hydrolyzable group selected from the group consisting of methoxymethyl, tetrahydro-pyranyl, trialkylsilyl, isopropoxymethyl, tetrahydrofuranyl, and tert-butoxycarbonyl groups, and letters c, d and e satisfy c+d+e=1, ##STR31## wherein each of R1, R3 and R5 is a hydrogen atom or met
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