4H-1-Benzopyran-4-one, 3,5,7-trihydroxy- 2-(2,4-dihydroxyphenyl)-, calcium complex Calcium, bis[3,5,7-trihydroxy-2-(2,4- dihydroxyphenyl)-4H-1-benzopyran-4-onato-0(4),0(8)]-,(T-4) NSC379669