c1c1im.zmat

c1c1im+

1   NA
2   CR    1  1.315
3   NA    2  1.315   1  109.8
4   CW    3  1.378   2  108.0    1    0.0
5   CW    4  1.341   3  107.1    2    0.0
6   C1    1  1.466   5  125.6    4  180.0
7   HCR   2  1.080   1  125.1    3  180.0
8   C1    3  1.466   2  126.3    1  180.0
9   HCW   4  1.080   3  126.45   2  180.0  
10  HCW   5  1.080   4  126.45   3  180.0
11  H1    6  1.090   1  109.5    5   60.0
12  H1    6  1.090   1  109.5    5  180.0
13  H1    6  1.090   1  109.5    5  300.0
14  H1    8  1.090   3  109.5    4   60.0
15  H1    8  1.090   3  109.5    4  180.0
16  H1    8  1.090   3  109.5    4  300.0

connect 5 1

improper  5  2  1  6
improper  1  3  2  7
improper  2  4  3  8
improper  3  5  4  9
improper  4  1  5 10

il.ff