| prov:value
| - wherein R1 and R???1 are alkylene, arylene, arylalkylene, or alkylarylene groups, R2 and R???2 are alkyl, aryl, arylalkyl, or alkylaryl groups, R3 and R???3 are hydrogen atoms or alkyl groups, R4 and R???4 are hydrogen atoms, fluorine atoms, alkyl groups, or phenyl groups, n is an integer of 0, 1, 2, 3, or 4, and R5 is an alkyl, aryl, arylalkyl, or alkylaryl group, or a substituent other than an a
|