RESIDUE 4AK 28 CONECT N 3 CA H H2 CONECT CA 4 N CB C HA CONECT CB 4 CA CG HB2 HB3 CONECT C 3 CA O OXT CONECT O 1 C CONECT O2 2 S1 H1 CONECT O3 1 S1 CONECT CG 4 CB CD HG2 HG3 CONECT CD 4 CG CE HD2 HD3 CONECT CE 4 CD NZ HE2 HE3 CONECT NZ 3 CE S1 HZ1 CONECT S1 4 O2 O3 NZ O4 CONECT O4 1 S1 CONECT H 1 N CONECT H2 1 N CONECT HA 1 CA CONECT HB2 1 CB CONECT HB3 1 CB CONECT HG2 1 CG CONECT HG3 1 CG CONECT HD2 1 CD CONECT HD3 1 CD CONECT HE2 1 CE CONECT HE3 1 CE CONECT HZ1 1 NZ CONECT OXT 2 C HXT CONECT H1 1 O2 CONECT HXT 1 OXT END HET 4AK 28 HETNAM 4AK N~6~-sulfo-L-lysine FORMUL 4AK C6 H14 N2 O5 S