Capsaicin

Capsaicin and Di-hydrocapsaicin together make up

80-90% of the Capsaicinoids found in peppers

Capsaicin

     H3CO              
                     \____          O           CH3
                   /     \        |            |
                 HO-<       >-C-N-C-(CH2)4-C=C-C-CH3
                  \____/   | |         | | | 
                             H2 H         H H H    

       H3CO             
                    \ ____          O       CH3
                   /     \        |        |
                 HO-<       >-C-N-C-(CH2)6-C-CH3
              \____/   | |       
                      H2 H