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RESI LACTIC         0.00
GROUP   
ATOM OD   OH1    -0.47  !     
ATOM HD   H       0.31  !  HD-OD
ATOM CA   CT1     0.07  !     |     HB1
ATOM HA   HB      0.09  !     |    /
GROUP                     !  HA-CA--CB-HB2
ATOM CB   CT3    -0.27  !     |    \
ATOM HB1  HA      0.09  !     |     HB3
ATOM HB2  HA      0.09  !   O=C
ATOM HB3  HA      0.09  !     |
GROUP                   !     OE-HE
ATOM C    C       0.51
ATOM O    O      -0.51
ATOM OE   OH1    -0.47  !     
ATOM HE   H       0.31  !
BOND CB CA  OD  HD  OD  CA  
BOND C  CA  C  OE OE HE CA HA  CB HB1  CB HB2  CB HB3
DOUBLE O  C
IMPR C O OE CA  
DONOR OD HD OE HE   
ACCEPTOR O C Á½¸öôÇ»ùÑõÒ²ÄܽÓÊÜѽ
IC -C   CA   *N   HN    1.3551 126.4900  180.0000 115.4200  0.9996
IC -C   N    CA   C     1.3551 126.4900  180.0000 114.4400  1.5390
IC N    CA   C    +N    1.4592 114.4400  180.0000 116.8400  1.3558
IC +N   CA   *C   O     1.3558 116.8400  180.0000 122.5200  1.2297
IC CA   C    OE   +CA   1.5390 116.8400  180.0000 126.7700  1.4613IC OD    C    *CA  CB    1.4592 114.4400  123.2300 111.0900  1.5461
IC OD    C    *CA  HA    1.4592 114.4400 -120.4500 106.3900  1.0840
IC C    CA   CB   HB1   1.5390 111.0900  177.2500 109.6000  1.1109
IC HB1  CA   *CB  HB2   1.1109 109.6000  119.1300 111.0500  1.1119
IC HB1  CA   *CB  HB3   1.1109 109.6000 -119.5800 111.6100  1.1114

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When specifying the connectivity of a chain of residues in a protein, it is necessary to refer to atoms in the previous or succeeding residue. The CHARMM topology file declares those atom types that will be referenced in adjoining residues as such:
DECL -CA
DECL -C
DECL -O
DECL +N
DECL +HN
DECL +CA

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