Amide-based linker
     RDKit          2D

  8  7  0  0  1  0  0  0  0  0999 V2000
   -1.9843    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.1182    0.9820    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.2678   -1.4730    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5669    0.4910    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.5669   -0.4910    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.9843    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.1182   -0.9820    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.2678    1.4730    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  1  3  1  0
  1  4  1  0
  4  5  1  0
  5  6  1  0
  6  7  1  0
  6  8  2  0
M  END
>  <s_m_entry_id>  (1) 
41

>  <s_m_entry_name>  (1) 
entry

>  <r_f3d_energy>  (1) 
0

>  <i_f3d_flags>  (1) 
0

$$$$
