1H-thiopyrano[3,4-c]pyridine-5-carbonitrile, 3,4-dihydro-6-hydroxy-8-methoxy- 6-hydroxy-8-methoxy-3,4-dihydro-1H-thiopyrano[3,4-c]pyridine-5-carbonitrile InChI=1/C10H10N2O2S/c1-14-10-8-5-15-3-2-6(8)7(4-11)9(13)12-10/h2-3,5H2,1H3,(H,12,13