Accuracy

1,2,3,4-tetramethyl benzene    290 1,2,3,4-Tetramethyl benzene

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    #  Species Formula
   280 1-Butynl benzeneC10H10
   281 2a,4a,6a,6b-TetrahydrocyclopentapentaleneC10H10
   282 BulvaleneC10H10
   283 DiisopropenyldiacetyleneC10H10
   284 Tricyclo[6.2.0.0]deca-1(8),2,6-trieneC10H10
   285 1,2,6,7-CyclodecatetraeneC10H12
   286 Dispiro[2.2.2.2]deca-4,9-dieneC10H12
   287 TetralinC10H12
   288 (1-Methylpropyl) benzeneC10H14
   289 (2-Methylpropyl) benzeneC10H14
   290 1,2,3,4-Tetramethyl benzene C10H14
   291 1,2,3,4-TetramethylfulveneC10H14
   292 1,2,3,5-Tetramethyl benzeneC10H14
   293 1,2,4,5-Tetramethyl benzeneC10H14
   294 tert-Butyl benzeneC10H14
   295 TetrahydrotriquinaceneC10H14
   296 1,2,3,4,5-Pentamethyl-1,3-cyclopentadieneC10H16
   297 AdamantaneC10H16
   298 CampheneC10H16
   299 PerhydrotriquinaceneC10H16
   300 1-Methyl-4-(1-methylethyl)-cyclohexeneC10H18


ΔHf: -8.6 kcal/mol,     REF: NIST Chemistry WebBook, NIST Standard Reference Database, No. 69; W. G. Mallard, P. J. Linstrom, Eds., National Institute of Standards and Technology, Gaithersberg, http://webbook.nist.gov/chemistry.
  
 PM7
1,2,3,4-Tetramethyl benzene
 H=-8.61 HR=NIST
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.38530211 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.40005797 +1  120.4908208 +1    0.0000000 +0     2     1     0
  C     1.39732463 +1  119.4859614 +1   -0.0439676 +1     3     2     1
  C     1.40956065 +1  120.0021171 +1   -0.0236764 +1     4     3     2
  C     1.39715033 +1  120.0120120 +1    0.0644407 +1     5     4     3
  H     1.08798255 +1  119.8576952 +1 -179.9602352 +1     1     2     3
  H     2.14880603 +1  100.5122625 +1 -155.1514686 +1     3     2     4
  H     1.77341254 +1   65.6306355 +1  -94.6956719 +1     8     3     2
  H     1.76426292 +1   59.8162801 +1  -76.3892597 +1     9     8     3
  H     1.08793518 +1  119.8612923 +1  179.9752732 +1     2     1     3
  C     1.09985560 +1   36.3098406 +1   38.8828057 +1     9     8    10
  C     1.49472831 +1  121.5162606 +1 -179.9653381 +1     4     3     5
  C     1.49472419 +1  118.4811311 +1 -179.9669405 +1     5     4     6
  C     1.49417730 +1  123.6477151 +1  179.9471555 +1     6     5     4
  H     1.09999119 +1  111.1710606 +1 -120.9571612 +1    13     4     3
  H     1.10009080 +1  111.0836607 +1 -119.8555236 +1    13     4    16
  H     1.09805578 +1  113.3717314 +1 -120.0530754 +1    13     4    17
  H     1.10001395 +1  111.1417544 +1   59.5103468 +1    14     5     4
  H     1.10009637 +1  111.1227191 +1 -119.8569964 +1    14     5    19
  H     1.09805539 +1  113.3720337 +1 -120.0628800 +1    14     5    20
  H     1.09990236 +1  110.9409073 +1  119.8764533 +1    15     6     5
  H     1.10001368 +1  110.9394128 +1  119.4064587 +1    15     6    22
  H     1.09754097 +1  113.6307546 +1  120.2401743 +1    15     6    23