Given a SMILES string for a molecule, I want to know the elements in the molecule, I then send this to basis_set_exchange to get a "custom" basis set for use in Gaussian.
I do know that given a molecular formula, like "H2O" molmass can return the elements. So, it would also suffice to have a program that simply takes a SMILES string and returns a molecular formula, then use molmass to get the elements.
However, this seems like such a trivial exercise, it must already be done. I don't want to make my own script for converting a SMILES to its elements just because I don't want to have to worry about corner cases or reinvent a wheel.