| http://www.w3.org/ns/prov#value | - [Cn HL .brket open-st.[X--Ra ]m where n is an integer, L is a number less than 0.1 n, m is less than 0.5 n, a is zero or a number less than 10, X is a polynuclear aromatic, polyheteronuclear aromatic or metallopolyheteronuclear aromatic moiety and R is as recited above.
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