| http://www.w3.org/ns/prov#value | - Herein R30, R31 and R32 each are a straight, branched or cyclic alkyl group of 1 to 20 carbon atoms, preferably 1 to 6 carbon atoms, each of R20, R21, R24, R25, R28, R29, R33, R34, R37, R38, R41 and R42 is a hydrogen atom or a straight, branched or cyclic alkyl group of 1 to 20 carbon atoms, preferably 1 to 6 carbon atoms, each of R22, R23, R26, R27, R35, R36, R39 and R40 is a hydrogen atom, a str
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