1,2-4-Triazine deriv. 3-[(1Z)-1,2,2-tris(5-Oxospiro[1H,4H-1,2,4-triazine-6,9'-fluorene]-3-ylthio)vinylthio]spiro[1H,4H-1,2,4-triazine-6,9'-fluorene]-5-one AIDS-051036 AIDS051036 NSC658725