prov:value
| - where R1 is hydrogen or a lower alkyl group, and R2 and R3 are independently selected from hydrogen, halogen, lower alkyl groups, lower alkoxy groups, lower alkyl groups substituted with 1 to 5 halogens, lower alkoxy groups substituted with 1 to 5 halogens, or both R2 and R3, when on adjacent carbons, together constitute ???O(CH2)xO??? where x is an integer of 1 to 4, thereby forming a ring struct
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