RESIDUE 2QB 20 CONECT NAH 1 NAG CONECT NAG 2 NAH NAF CONECT NAF 2 NAG CAE CONECT CAE 4 NAF C5 H2 H3 CONECT C5 3 CAE C6 C4 CONECT C6 3 C5 N1 H4 CONECT N1 2 C6 C2 CONECT C2 3 N1 CAL N3 CONECT CAL 4 C2 H5 H6 H7 CONECT N3 2 C2 C4 CONECT C4 3 C5 N3 NAA CONECT NAA 3 C4 H8 H9 CONECT H2 1 CAE CONECT H3 1 CAE CONECT H4 1 C6 CONECT H5 1 CAL CONECT H6 1 CAL CONECT H7 1 CAL CONECT H8 1 NAA CONECT H9 1 NAA END HET 2QB 20 HETNAM 2QB 5-(azidomethyl)-2-methylpyrimidin-4-amine FORMUL 2QB C6 H8 N6