| http://www.w3.org/ns/prov#value | - The preferred R substituents are as follows: R1 is hydrogen; R2, and R3 are, independently, hydrogen, methyl, ethyl, isopropyl, tert-butyl, phenyl, trimethylsilyl, or part of a cycloalkyl group, including cyclohexyl, adamantyl, or 3,3,5,5-tetramethylcyclohexyl; R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, and R14 are hydrogen or methyl; and R15 and R16 are hydrogen, methyl, or phenyl.
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