bis[5-[3-(5-cyano-1-hexyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridyl)allylidene]-1-hexyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxonicotinonitrile], calcium salt

Calcium bis[[3-[3-[(3-cyano-1-hexyl-1,2,5,6-tetrahydro-4-methyl-2,6-dioxopyridin)-5-ylidene]-1-propenyl]-5-cyano-1,6-dihydro-1-hexyl-4-methyl-6-oxopyridine]-2-olate]