| http://www.w3.org/ns/prov#value | - In this formula (a), Z1 is a group which makes a nucleophilic attack on G1 and cleaves the G1 -R3 -Z1 moiety from the rest of the molecule and R3 is a group derived by removing one hydrogen atom from R2 in general formula (I), and Z1 can make a nucleophilic attack on G1 and form a ring structure with G1, R3 and Z1.
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