Accuracy

c4h4r    107 CH2=C=C=CH2 (Geo)

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    #  Species Formula
    97 i-Propyl radicalC3H7
    98 PropaneC3H8
    99 Propane (Geo)C3H8
   100 Isopropyl lithiumH7LiC3
   101 Isopropyl lithium (Geo)H7LiC3
   102 Trimethyborane (Geo)H9BC3
   103 TrimethylboraneH9BC3
   104 Carbon, tetramerC4
   105 Diacetylene (Geo)C4H2
   106 DiacetyleneC4H2
   107 CH2=C=C=CH2 (Geo) C4H4
   108 CH2=C=C=CH2C4H4
   109 Vinylacetylene (Geo)C4H4
   110 VinylacetyleneC4H4
   111 1,2-ButadieneC4H6
   112 1,3-ButadieneC4H6
   113 1-ButyneC4H6
   114 2-ButyneC4H6
   115 Bicyclobutane (Geo)C4H6
   116 BicyclobutaneC4H6
   117 2-Butyne (Geo)C4H6


REF: A. Almenningen, O. Bastiansen, M. Traetteberg, Acta Chem. Scand., 15, 1557 (1961).
  
 GNORM=10 PM7
CH2=C=C=CH2
 <C-H> <C1-C2> < > <C2-C3> GR=ABT1961
  H     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.08300000 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.31800000 +1  121.8654103 +1    0.0000000 +0     2     1     0
  C     1.28300000 +1  180.0000000 +0  175.4153930 +1     3     2     1
  C     1.30558105 +1  180.0000000 +0   -4.5841520 +1     4     3     1
  H     1.08300662 +1  122.8726300 +1   -0.0017192 +1     5     4     1
  H     1.08146431 +1  115.4822141 +1  179.9989251 +1     2     1     3
  H     1.08299435 +1  122.8817279 +1 -179.9999438 +1     5     4     6