This tool allows to generate a list of molecular formulas. You may either enter a target mass (experimental exact mass), elemental analysis results or enter a minimal and maximal mass range.

Enter the number of each atom that you allow in the molecular formula.

min. max.
number of C
number of H
number of N
number of O
number of F
number of Cl
number of Br
number of I
 or  Use the "power mode" in which you directly enter the allowed Molecular Formula in the format Xn-mYo-p (overrid the left table) (ex. C1-10H1-15B2):
 

You want to generate a listing ? Enter here the mass range: to .

You have an exact mass result ? Enter it here: .

You have elemental analysis results ? Enter them here:
%C , %H , %N , %O , %F , %Cl , %Br , %I .

You want to limit the result by insaturations ? The number of insaturations can be taken into account if only the following elements are allowed : H, C, O, N, F, Cl, Br, I. It is defined as ((2*nC - nH - nCl- nF - nI - nBr + nN) / 2) +1.
Allow only from to insaturations. Allows only integer values .