prov:value
| - nt when n is 2 or larger; Y is represented by the formula shown above, q is an integer of 1 to 5, and Y's may be each different when q is 2 or larger; R4 and R5 are, each independently, hydrogen, straight-chain or branched alkyl having 1 to 6 carbons, phenyl or aralkyl; p is an integer of 1 or 2, and R4 and R5 may be each different when p is 2; R6 and R7 are, each independently, hydrogen, optional
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