Reaction catalyzed by laccase (1.10.3.2)

		+			=
	benzenediol	+		thiobarbituric acid	=		1,1'',3,3''-tetraethyl-2',3',6',7'-tetrahydroxy-2,2''-dithioxo-2H,2''H-dispiro[pyrimidine-5,9'-anthracene-10',5''-pyrimidine]-4,4'',6,6''(1H,1''H,3H,3''H)-tetrone