prov:value
| - outside of these ranges, such as tolyl or the like, wherein R1 and R2 can be joined together to form a ring, wherein R3 and R can be joined together to form a ring, and wherein R1, R2, R3, and R4 can each be joined to a phenyl ring in the central structure, wherein in embodiments, at least one of R1, R2, R3 and R4 is an alkyl group, wherein in embodiments, at least one of R1, R2, R3 and R4 is an
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