prov:value
| - hylene groups is optionally replaced by oxygen atom, a carbonyl group, urethane, urea, an ester group, a ???NR3 group, a CHR4 group, or a CR5R6 group where R3, R4, R5, and R6 are, independently, H, an alkyl group, or an aryl group; and Y is a bond, carbon atom, nitrogen atom, oxygen atom, sulfur atom, a branched or linear ???(CH2)p??? group where p is an integer between 0 and 10, an aryl group, a
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