RESIDUE 15L 21 CONECT C1 3 O1 C2 O5 CONECT O1 1 C1 CONECT C2 4 C1 O2 C3 H2 CONECT O2 2 C2 HO2 CONECT C3 4 C2 O3 C4 H3 CONECT O3 2 C3 HO3 CONECT C4 4 C3 O4 C5 H4 CONECT O4 2 C4 HO4 CONECT C5 4 C4 O5 C6 H5 CONECT O5 2 C1 C5 CONECT C6 3 C5 O6A O6B CONECT O6A 1 C6 CONECT O6B 2 C6 H8 CONECT H2 1 C2 CONECT HO2 1 O2 CONECT H3 1 C3 CONECT HO3 1 O3 CONECT H4 1 C4 CONECT HO4 1 O4 CONECT H5 1 C5 CONECT H8 1 O6B END HET 15L 21 HETSYN 15L galactaro-1,5-lactone; (2S,3R,4S,5R,6S)-3,4,5-trihydrox HETSYN 2 15L y-6-oxidotetrahydro-2H-pyran-2-carboxylate HETNAM 15L D-galactaro-1,5-lactone FORMUL 15L C6 H8 O7