prov:value
| - R4 and R5, independently of each other and other R4 and R5 in the compound, are selected from the group consisting of a hydrogen, a halogen, a ???N(R)2, or ???SR group, an optionally substituted alkyl group, an optionally substituted alkenyl group, an optionally substituted alkoxy group, and an optionally substituted aryl group, where each R, independent of any other R in any listed group, is sele
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