Accuracy

2,3,4-trimethyl pentane    253 2,3,4-Trimethyl pentane

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    #  Species Formula
   243 4-OctyneC8H14
   244 Bicyclo(2.2.2)-octaneC8H14
   245 Bicyclo-2,2,2-octaneC8H14
   246 1-OcteneC8H16
   247 EthylcyclohexaneC8H16
   248 2,2,3,3-Tetramethyl butaneC8H18
   249 2,2,3-Trimethyl pentaneC8H18
   250 2,2,4-Trimethyl pentaneC8H18
   251 2,2-Dimethyl hexaneC8H18
   252 2,3,3-Trimethyl pentaneC8H18
   253 2,3,4-Trimethyl pentane C8H18
   254 2,3-Dimethyl hexaneC8H18
   255 2,4-Dimethyl hexaneC8H18
   256 2,5-Dimethyl hexaneC8H18
   257 2-Methyl heptaneC8H18
   258 3,3-Dimethyl hexaneC8H18
   259 3,4-Dimethyl hexaneC8H18
   260 3-Ethyl hexaneC8H18
   261 3-Ethyl-2-methyl pentaneC8H18
   262 3-Ethyl-3-methyl pentaneC8H18
   263 3-Methyl heptaneC8H18


ΔHf: -52.0 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
2,3,4-Trimethyl pentane
 HR=NIST H=-51.97
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.53189020 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.55231990 +1  114.1209620 +1    0.0000000 +0     2     1     0
  C     1.55247237 +1  111.4479014 +1  -83.6685293 +1     3     2     1
  C     1.53160495 +1  114.0728440 +1   84.3757910 +1     4     3     2
  C     1.53764553 +1  109.7261894 +1  122.8575250 +1     4     3     5
  C     1.53759313 +1  109.1152659 +1  123.2437576 +1     2     1     3
  C     1.53058678 +1  112.5774322 +1  127.7056027 +1     3     2     4
  H     1.09508340 +1  111.5991647 +1  -67.5095337 +1     1     2     3
  H     1.09552227 +1  111.7061534 +1  120.6911501 +1     1     2     9
  H     1.09571573 +1  110.7901706 +1  119.7237851 +1     1     2    10
  H     1.11860143 +1  108.0199523 +1  117.0025455 +1     2     1     7
  H     1.12249799 +1  106.3342446 +1  116.8776666 +1     3     2     8
  H     1.11867699 +1  107.7819348 +1  117.2191901 +1     4     3     6
  H     1.09576836 +1  111.6513446 +1  -52.4289340 +1     5     4     3
  H     1.09550314 +1  111.5279492 +1  120.2969240 +1     5     4    15
  H     1.09530647 +1  110.9373053 +1  119.7023360 +1     5     4    16
  H     1.09493330 +1  111.3382233 +1  -61.1889758 +1     6     4     3
  H     1.09437283 +1  111.5211790 +1  120.3911470 +1     6     4    18
  H     1.09500862 +1  111.0506223 +1  119.8861137 +1     6     4    19
  H     1.09448167 +1  111.4864867 +1  174.6569334 +1     7     2     1
  H     1.09488962 +1  111.3738185 +1  120.3131294 +1     7     2    21
  H     1.09489916 +1  111.0783423 +1  119.7939258 +1     7     2    22
  H     1.09532946 +1  111.0491527 +1  176.3149953 +1     8     3     2
  H     1.09500561 +1  111.9219707 +1  120.0746837 +1     8     3    24
  H     1.09525032 +1  111.0559696 +1  120.1017977 +1     8     3    25