prov:value
| - In a specific embodiment, R1 and R2 is each independently hydrogen, methyl, ethyl, propyl, trifluoropropyl, phenyl, ethylphenyl, methoxy, ethoxy or phenoxy; R3 and R4 is each independently a methyl, ethyl, propyl, trifluoropropyl, phenyl, ethylphenyl, methoxy, ethoxy or phenoxy; and R5 is a hydrogen, methyl, ethyl, propyl, trifluoropropyl, phenyl, or ethylphenyl.
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