RESIDUE 2EC 21 CONECT N6 3 C6 H61N H62N CONECT C6 3 N6 C5 N1 CONECT C5 3 C6 N7 C4 CONECT N7 2 C5 C8 CONECT C4 3 C5 N9 N3 CONECT N9 3 C4 C8 C9M CONECT C8 3 N7 N9 H8 CONECT C9M 4 N9 C50 H9M1 H9M2 CONECT N3 2 C4 C2 CONECT C50 4 C9M H501 H502 H503 CONECT C2 3 N3 N1 H2 CONECT N1 2 C6 C2 CONECT H61N 1 N6 CONECT H62N 1 N6 CONECT H8 1 C8 CONECT H9M1 1 C9M CONECT H9M2 1 C9M CONECT H501 1 C50 CONECT H502 1 C50 CONECT H503 1 C50 CONECT H2 1 C2 END HET 2EC 21 HETNAM 2EC 9-ETHYL-9H-PURIN-6-YLAMINE FORMUL 2EC C7 H9 N5