prov:value
| - linkage, X and X??? each, independently of the other, is ???O??? or ???NR3??? wherein each R3, independently of the other, is a hydrogen atom, an alkyl group, an aryl group, an arylalkyl group, or an alkylaryl group, and R2 is an alkylene group, an arylene group, an arylalkylene group, or an alkylarylene group.
|