| http://www.w3.org/ns/prov#value | - represents an alkylene group having a C2-3 carbon atom content , R3 and R4 independently denote a hydrogen atom or an alkyl group having a C1-3 carbon atom content, R5 and R6 independently denote a hydrogen atom, or an alkyl, alkenyl, or phenyl group with or without the hydrogen atom(s) being substituted with group(s) containing hetero atom(s), excepting for a mercapto group, m is an integer of 0-
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