| http://www.w3.org/ns/prov#value | - where none, one or two of positions 1 to 6 are a heteroatom selected from N for position 1 and the position to which R6 is bound if such position does not comprise C, and otherwise S, O or NH, provided that R5 including R6 comprises only one N if R4 comprises an amine, and otherwise R5 including R6 comprises a diamine,
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