8-(2,4-Dimethoxyphenyl)-6-hydroxy-6-(hydroxymethyl)-7,8-dihydro-6H-[1,3]dioxolo[4,5-g]chromene-7-carboxylic acid compound with 9-(2,4-dimethoxyphenyl)-5a-hydroxy-5a,6,8a,9-tetrahydro-8H-[1,3]dioxolo[4\t,5-g]furo[3,4-b]chromen-8-one (1:1) AIDS-156429 AIDS156429 NSC619690