prov:value
| - Referring, now, to the above formula (I), R2 means hydrogen or a halogen such as chlorine and bromine, R3 stands for methyl, acetoxymethyl, carbamoyloxymethyl, an alkoxymethyl such as methoxymethyl, an alkylthiomethyl such as methylthiomethyl, 2-carboxy-1-ethenyl, or a heterocyclicthiomethyl group.
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