prov:value
| - R6 and R7 are alkyl groups having up to 12 carbons, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, sec-pentyl, t-pentyl, neopentyl, n-hexyl, isohexyl, heptyl or octyl; or optionally substituted phenyl, or optionally substituted aralkyl such as benzyl or phenethyl.
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