prov:value
| - to which they are bonded, form a C3-8 cycloalkyl group; and R3, R4, X1, Xa, Xb, and Ar1 are as defined in (a) and (b); or (f) R3 and R4, together with the carbon atom to which they are bonded, form a C3-8 cycloalkyl group; and R1, R2, X1, Xa, Xb, and Ar1 are as defined in (a) and (b), and particularly preferably, (a) R1, R2, R3, and R4 are the same or different and each represent a hydrogen atom
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