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Parses a chemical formula (parentheses, brackets, hydrate dots such as CuSO4·5H2O, an ignored charge) for a chemist or an agent that must check a molar mass, and returns the Hill-notation formula, the formula weight in g/mol from the CIAAW abridged standard atomic weights summed exactly in decimal arithmetic, and mass fractions. Pass claimedWeight and tolerance to check a stated molar mass. Elements with no standard atomic weight (technetium, promethium, elements above bismuth except thorium, protactinium and uranium) return unknown unless you supply elementWeights. A separate mode validates SMILES syntax against the OpenSMILES grammar. It does NOT compute a weight from SMILES, handle isotope or deuterium notation, or check that a compound exists.