compound 2-demethylmenaquinone C20H22O2 compound InChI=1S/C20H22O2/c1-14(2)7-6-8-15(3)11-12-16-13-19(21)17-9-4-5-10-18(17)20(16)22/h4-5,7,9-11,13H,6,8,12H2,1-3H3/b15-11+ CHEBI:28192 UPa:UPC05818 KEGG:C05818