compound 7,8-dihydropteroate CHEBI:4581 C14H14N6O3 compound dihydropteroate CHEBI:17839 InChI=1S/C14H14N6O3/c15-14-19-11-10(12(21)20-14)18-9(6-17-11)5-16-8-3-1-7(2-4-8)13(22)23/h1-4,16H,5-6H2,(H,22,23)(H4,15,17,19,20,21) KEGG:C00921 UPa:UPC00921