glycoaldehyde (H2O)_3    C2H4O2 + 3 x H2O = C2 H10 O5
c
c  parent species
c
  1  -2
  3  -1
 1947.220010       0.000980
 1338.574010       0.000740
 1269.991990       0.000740
114.0528226
c
c  O(1)
c
 1893.844800      0.001600
 1323.054800      0.001400
 1233.473800      0.001200
2.0042464
c
c  O(2)
c
 1931.356900       0.001900
 1302.224400       0.001000
 1239.324140       0.000960
2.0042464
c
c  O(3)
c
 1886.659200       0.001500
 1326.549100       0.001100
 1246.877600       0.001100
2.0042464
end


H2O = 2 * 1.00782503207 + 15.9949146221 = 18.0105646