| http://www.w3.org/ns/prov#value | - er to form a ring, or R13 and R14, or R18 and R19 may be bonded together to form a ring; and L2 is a single bond, ???O???, ???S???, ???N(R)??? (R is an alkyl group or a substituted or unsubstituted aryl group), an alkylene group or an arylene group.
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