RESIDUE FBE 16 CONECT C 3 C1 O H CONECT O 1 C CONECT C1 4 C C2 1H1 2H1 CONECT C2 3 C1 C3 H2 CONECT C3 3 C2 C4 H3 CONECT C4 4 C3 N 1H4 2H4 CONECT N 3 C4 1HN 2HN CONECT H 1 C CONECT 1H1 1 C1 CONECT 2H1 1 C1 CONECT H2 1 C2 CONECT H3 1 C3 CONECT 1H4 1 C4 CONECT 2H4 1 C4 CONECT 1HN 1 N CONECT 2HN 1 N END HET FBE 16 HETNAM FBE 1-FORMYL-4-AMINO-2,3-BUTENE FORMUL FBE C5 H9 N1 O1