| http://www.w3.org/ns/prov#value | - In the general formula [M-X], it is preferred that (i) at least two of Rm9 through Rm11 are alkyl groups, or that (ii) one of Rm9 through Rm11, for example, Rm11 is a hydrogen atom, whereby the other two i.e. Rm9 and Rm10 are combined with each other to form cycloalkyl together with a root carbon atom.
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