RESIDUE 4MU 21 CONECT C5 3 C6 C4A H5 CONECT C6 3 C5 C7 H6 CONECT C7 3 C6 C8 O1' CONECT C2 3 C3 O2 O1 CONECT C3 3 C2 C4 H3 CONECT C4 3 C3 CM4 C4A CONECT O2 1 C2 CONECT O1 2 C2 C8A CONECT CM4 4 C4 HM4 HM4A HM4B CONECT C4A 3 C5 C4 C8A CONECT C8A 3 O1 C4A C8 CONECT C8 3 C7 C8A H8 CONECT O1' 2 C7 HO1' CONECT H5 1 C5 CONECT H6 1 C6 CONECT H3 1 C3 CONECT HM4 1 CM4 CONECT HM4A 1 CM4 CONECT HM4B 1 CM4 CONECT H8 1 C8 CONECT HO1' 1 O1' END HET 4MU 21 HETSYN 4MU 4-methylumbelliferone HETNAM 4MU 7-hydroxy-4-methyl-2H-chromen-2-one FORMUL 4MU C10 H8 O3