RESIDUE   6SE      5
CONECT      SE1    2 SE2  HSE1
CONECT      SE2    2 SE1  SE3 
CONECT      SE3    2 SE2  HSE3
CONECT      HSE1   1 SE1 
CONECT      HSE3   1 SE3 
END   
HET    6SE              5
HETNAM     6SE triselane
FORMUL      6SE    H2 Se3