| http://www.w3.org/ns/prov#value | - where at least two of the A, B and C napthyl rings are substituted by a sulphonate group, the C ring may be substituted at the 5 position by an NH2 or NHPh group, X is a phenyl or napthyl ring substituted with upto 2 sulphonate groups and may be substituted at 2 position with a OH group and may also be substituted with an NH2 or NHPh group,
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