formula 

<h:div class="summary">Simple chemical formula.</h:div>
<h:div class="general">This attribute should only be used for simple formulae (i.e. without brackets or other nesting for which a _formula_ child element should be used. The attribute might be used as a check on the child elements or for ease of representation. Essentially the same as _concise_ attribute on _formula.</h:div>

Attribute Information

Used By

Attribute Group formula

Source 

<xsd:attribute id="att.formula" name="formula" type="formulaType">
  <xsd:annotation>
    <xsd:documentation>
      <h:div class="summary">Simple chemical formula.</h:div>
      <h:div class="general">This attribute should only be used for simple formulae (i.e. without brackets or other nesting for which a _formula_ child element should be used. The attribute might be used as a check on the child elements or for ease of representation. Essentially the same as _concise_ attribute on _formula.</h:div>
    </xsd:documentation>
  </xsd:annotation>
</xsd:attribute>

Sample