RESIDUE 01R 21 CONECT N19 3 C20 H19 H2 CONECT C20 4 N19 C30 H201 H202 CONECT C30 4 C20 N27 H301 H302 CONECT N27 3 C30 C21 H27 CONECT C21 3 N27 C22 C26 CONECT C22 3 C21 C23 H22 CONECT C23 3 C22 N24 H23 CONECT N24 2 C23 C25 CONECT C25 3 N24 C26 H25 CONECT C26 3 C21 C25 H26 CONECT H19 1 N19 CONECT H201 1 C20 CONECT H202 1 C20 CONECT H301 1 C30 CONECT H302 1 C30 CONECT H27 1 N27 CONECT H22 1 C22 CONECT H23 1 C23 CONECT H25 1 C25 CONECT H26 1 C26 CONECT H2 1 N19 END HET 01R 21 HETNAM 01R N-(pyridin-4-yl)ethane-1,2-diamine FORMUL 01R C7 H11 N3