2H-1-benzopyran-6-ol, 3,4-dihydro-7-methoxy-2,2-dimethyl-5-nitro- 7-methoxy-2,2-dimethyl-5-nitrochroman-6-ol InChI=1/C12H15NO5/c1-12(2)5-4-7-8(18-12)6-9(17-3)11(14)10(7)13(15)16/h6,14H,4-5H2,1-3H