| http://www.w3.org/ns/prov#value | - of G1 to Gf may be bonded to each other to form a ring; f is an integer given by the formula, [(valence of central metal M4)+1]. [Z2]??? is a conjugated base of Br???nsted acid having a logarithm of reciprocal of acid dissociation constant (pKa) of ???10 or lower, a conjugated base of a combination of the Br???nsted acid and a Lewis acid, or a conjugated base of an acid generally defined as supers
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