úΑ.portablealpha&Krzysztof Langner <klangner@gmail.com> Safe-InferredParse formula K parseFormula "C2H4" `shouldBe` Formula [(element 6, 2), (element 1, 4)]  radium-formula-parser-0.1Chemistry.FormulaFormulaFElementFGroup parseFormula ElementSymbolformula elementSymbol