Catalysis of the reaction: luteolin 7-O-[(beta-D-glucosiduronate)-(1->2)-(beta-D-glucosiduronate)] + UDP-alpha-D-glucuronate = H(+) + luteolin 7-O-[(beta-D-glucosiduronate)-(1->2)-(beta-D-glucosiduronate)] 4'-O-beta-D-glucosiduronate + UDP.
Source:http://purl.uniprot.org/go/0047247
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