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        H                   H   H                H   H
                            \ /                  \ /
        C       O             C       O            C       O
       / \\    //            / \\    //           / \     //
     HC   C - C            HC   C - C           HC   C - C
             \                   \                  \
     HC   CH    NH2        HC   CH    NH2       HC   CH    NH2
       \ //                  \ //                 \ /
        N+                    N                    N
                                                 
        R                     R                    R
             1.                    2.                    3.




!^3

       ?

    O                     O                O                     O
                                                              
    C                     C                C                     C
   / \                   / \              / \                   / \
 HN   NH               HN   N - COOH    HN   NH               HN   N - COOH
                                                            
 HCCH               HCCH          HCC - COOH         HCCH
                                                            
H C   CH(CH ) COOH    H C   CH         H C   CH(CH ) COOH    H C   CH(CH ) COOH
  \ /      4          \ /            \ /      4          \ /      4
    S                     S                S                     S

           1.                   2.                3.                    4.



!^4

                    CH NH                                   H   H
                                                     \ /
             HO   C            1.                   2.      C    O
         \ / \\                                      / \  //
  ?                C   C-CH -OPO H                           C   C-C
    2                            3                                \
                   H C-C   CH                                    C   C   NH
                    3   \ //                                      \ /      
                         N                        CH3          R - N
                                             H C    CH
H CO   C = O                                  3  \N/   3
 3  \/   \                 3.                   /   .
    C     C            CH                    H C     O
                      3                         
    C     C - [CH -CH =C -CH ] -H       R-C-O-HC     C
    /\   /                  n                \ H / \\    4.
H CO   C = O                              O       C    O
 3                                                H
!^2

         ?


                                                 H
HOOC-CH-CH -CH -CO-NH-CH-CO-NH-CH -COOH         HC -CH -CH -(CH ) - COOH
       2  2                    2                   2       2 4
            NH        CH                         SH     SH
              2        2              1.                             2.
                      SH
     CH
      3                             HOOC-CH-CH -CH -CO-NH-CH-CO-NH-CH -COOH
 CH -C -CH -CH -(CH ) - COOH                  2   2                 2
   3     2       2 4                    NH               CH
     SH     SH                              2               2
                            3.                             SH          4.



!^4

          ?


                                                 H
HOOC-CH-CH -CH -CO-NH-CH-CO-NH-CH -COOH         HC -CH -CH -(CH ) - COOH
         2   2                 2                   2       2 4
     NH               CH                         SH     SH
       2               2              1.                             2.
                      SH
     CH
      3                             HOOC-CH-CH -CH -CO-NH-CH-CO-NH-CH -COOH
 CH -C -CH -CH -(CH ) - COOH                   2                    2
   3     2       2 4                           NH        CH
     SH     SH                                     2        2
                            3.                             SH          4.



!^2


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