RESIDUE 2AS 19 CONECT C 3 O CA OXT CONECT O 1 C CONECT CA 4 C N CB HA CONECT N 3 CA H H2 CONECT CB 4 CA CG C4 HB2 CONECT CG 3 CB OD1 OD2 CONECT OD1 2 CG HD2 CONECT C4 4 CB H4 H4A H4B CONECT OD2 1 CG CONECT OXT 2 C HXT CONECT HA 1 CA CONECT H 1 N CONECT H2 1 N CONECT HB2 1 CB CONECT H4 1 C4 CONECT H4A 1 C4 CONECT H4B 1 C4 CONECT HD2 1 OD1 CONECT HXT 1 OXT END HET 2AS 19 HETNAM 2AS (2S,3S)-3-methyl-aspartic acid FORMUL 2AS C5 H9 N O4