prov:value
| - to about 4 carbon atoms, although the number of carbon atoms can be outside of this range, R2 and R3 each, independently of the other, is a hydrogen atom, an alkyl group (including linear, branched, cyclic, saturated, unsaturated, and substituted alkyl groups, and wherein hetero atoms, such as oxygen, sulfur, nitrogen, silicon, or the like, can be placed between the carbon atoms in the alkylene gr
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