prov:value
| - Preferred fused heteroaromatic rings include substituted or unsubstituted one or more of R1, R2, and R6 is an aryl or heteroaryl ring that is optionally substituted one or more times by C1-C6 alkyl, C1-C6 perfluoroalkyl, cyano, halogen, azido, carboxylic acid, sulfonic acid, or halomethylpyridines, thiophenes, pyrroles, indoles, oxazoles, benzothiophenes, and benzoxazoles.
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