prov:value
| - Z???, where Y??? is halogen, OH, OR4, or a functional group having a molecular weight equal to or less than 100,000 daltons, R4 is a functional group having a molecular weight equal to or less than 100,000 daltons, R5 is a methylene group or an ethylene group, X is H, vinyl, ethyl, acetyl or formyl, and Y is meth
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