prov:value
| - y such as an acyl moiety, optionally substituted alkyl or optionally substituted alkylaryl, R2 is a halogen or an oxygen-bonded or a sulfur-bonded moiety, R2A is ???H, absent, a carbon-bonded moiety, R3 is a halogen or an oxygen-bonded or a sulfur-bonded moiety, R3B is ???H, absent, a carbon-bonded moiety, R4 is a halogen, an oxygen-bonded or a sulfur-bonded moiety, R4A is ???H, absent, a carbon-b
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