RESIDUE 4UD 18 CONECT C3 3 C5 N1 H1 CONECT C4 4 C5 C6 O2 H3 CONECT C5 4 C3 C4 H4 H5 CONECT C6 4 C4 C8 N7 H6 CONECT C8 3 C6 O9 O10 CONECT O9 2 C8 H7 CONECT O10 1 C8 CONECT N7 3 C6 H8 H9 CONECT O2 2 C4 N1 CONECT N1 2 C3 O2 CONECT H1 1 C3 CONECT H3 1 C4 CONECT H4 1 C5 CONECT H5 1 C5 CONECT H6 1 C6 CONECT H7 1 O9 CONECT H8 1 N7 CONECT H9 1 N7 END HET 4UD 18 HETNAM 4UD (2S)-amino[(5S)-4,5-dihydro-1,2-oxazol-5-yl]acetic acid FORMUL 4UD C5 H8 N2 O3