| http://www.w3.org/ns/prov#value | - where one or more of positions 1 to 6 are a heteroatom selected from N for position 1 and S, O or NH for positions 2 to 6, provided that R5 together with R6 comprises only one N if R4 comprises an N, no N is present if R4 comprises a diamine and otherwise R5 including R6 comprises a diamine,
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