RESIDUE 53U 51 CONECT N1 3 C2 HN1 HN1A CONECT C2 4 N1 C3 C1 H2 CONECT C3 3 C2 O1 N2 CONECT O1 1 C3 CONECT C1 4 C2 C16 H1 H1A CONECT C16 3 C1 C17 C21 CONECT C17 3 C16 C18 H17 CONECT C21 3 C16 C20 H21 CONECT C18 3 C17 C19 H18 CONECT C20 3 C21 C19 H20 CONECT C19 3 C18 C20 H19 CONECT N2 3 C3 C7 C4 CONECT C7 4 N2 C8 C6 H7 CONECT C8 3 C7 O2 N3 CONECT O2 1 C8 CONECT C6 4 C7 C5 H6 H6A CONECT C5 4 C6 C4 H5 H5A CONECT C4 4 N2 C5 H4 H4A CONECT N3 3 C8 C9 HN3 CONECT C9 4 N3 C10 H9 H9A CONECT C10 3 C9 C11 C15 CONECT C11 3 C10 C12 H11 CONECT C12 3 C11 C13 H12 CONECT C13 3 C12 C14 H13 CONECT C14 3 C13 C15 H14 CONECT C15 3 C10 C14 H15 CONECT HN1 1 N1 CONECT HN1A 1 N1 CONECT H2 1 C2 CONECT H1 1 C1 CONECT H1A 1 C1 CONECT H17 1 C17 CONECT H21 1 C21 CONECT H18 1 C18 CONECT H20 1 C20 CONECT H19 1 C19 CONECT H7 1 C7 CONECT H6 1 C6 CONECT H6A 1 C6 CONECT H5 1 C5 CONECT H5A 1 C5 CONECT H4 1 C4 CONECT H4A 1 C4 CONECT HN3 1 N3 CONECT H9 1 C9 CONECT H9A 1 C9 CONECT H11 1 C11 CONECT H12 1 C12 CONECT H13 1 C13 CONECT H14 1 C14 CONECT H15 1 C15 END HET 53U 51 HETSYN 53U (2S)-1-((2R)-2-amino-3-phenyl-propanoyl)-N-(phenylmethy HETSYN 2 53U l)pyrrolidine-2-carboxamide HETNAM 53U D-phenylalanyl-N-benzyl-L-prolinamide FORMUL 53U C21 H25 N3 O2