| http://www.w3.org/ns/prov#value | - Two preferred cases of the formula (M-IX) are described below: (i) at least two of R9 -R11 are alkyl groups; and (ii) one of R9 -R11, for example, R11, is a hydrogen atom and the other groups (R9 and R10) combine to form a cycloalkyl together with the common carbon atom.
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