private static IAtomContainer ToAtomContainer(IChemFile co)
{
var cm = co.FirstOrDefault();
if (cm != null)
{
var sm = cm.FirstOrDefault()?.MoleculeSet;
if (sm != null)
{
var ssm = sm.FirstOrDefault();
if (ssm != null)
{
return(ssm);
}
}
}
return(null);
}