Accuracy

2a,4a,6a,6b-tetrahydrocyclopentapentalene    281 2a,4a,6a,6b-Tetrahydrocyclopentapentalene

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    #  Species Formula
   271 cis-cis-trans-1,3,5-Trimethyl cyclohexaneC9H18
   272 3,3-DiethylpentaneC9H20
   273 n-NonaneC9H20
   274 Tri-isopropylboraneH21BC9
   275 TripropylboraneH21BC9
   276 AzuleneC10H8
   277 Naphthalene (Geo)C10H8
   278 NaphthaleneC10H8
   279 1,4-Dicyclopropylbuta-1,3-diyneC10H10
   280 1-Butynl benzeneC10H10
   281 2a,4a,6a,6b-Tetrahydrocyclopentapentalene C10H10
   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 benzeneC10H14
   291 1,2,3,4-TetramethylfulveneC10H14


ΔHf: 53.1 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
2a,4a,6a,6b-Tetrahydrocyclopentapentalene
 H=53.1 HR=NIST
  C     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
  C     1.33888724 +1    0.0000000 +0    0.0000000 +0     1     0     0
  C     1.50695792 +1  112.6419311 +1    0.0000000 +0     1     2     0
  C     1.50682021 +1  111.8689511 +1 -110.4786956 +1     3     1     2
  C     1.33900655 +1  112.6450106 +1  110.5649999 +1     4     3     1
  C     1.50698766 +1  112.6307187 +1   -0.0618875 +1     5     4     3
  C     1.50699294 +1  111.8056129 +1 -110.4416461 +1     6     5     4
  C     1.33898956 +1  112.6381421 +1  110.5293229 +1     7     6     5
  C     1.50692855 +1  112.6411711 +1   -0.0237005 +1     2     1     3
  C     1.56650174 +1  104.3997836 +1    1.8425720 +1     3     1     2
  H     1.07447426 +1  127.5620580 +1 -179.3512594 +1     1     2     9
  H     1.07451296 +1  127.5541163 +1  179.3294230 +1     2     1     3
  H     1.10762537 +1  111.7153600 +1  123.3929236 +1     3     1     2
  H     1.07451708 +1  119.7950632 +1  -68.8562461 +1     4     3     1
  H     1.07448576 +1  127.5606148 +1 -179.3814133 +1     5     4     3
  H     1.10752849 +1  111.7629690 +1  123.4516183 +1     6     5     4
  H     1.07456454 +1  119.7914990 +1  -68.8360836 +1     7     6     5
  H     1.07449906 +1  127.5639756 +1 -179.3054310 +1     8     7     6
  H     1.10758957 +1  111.7593045 +1 -123.3831906 +1     9     2     1
  H     1.09375444 +1  112.9103215 +1  121.1713276 +1    10     3     1