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molecularFormula

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
Thing > Property :: molecularFormula
The empirical formula is the simplest whole number ratio of all the atoms in a molecule.
Values expected to be one of these types
Text
Used on these types
MolecularEntity

Source

http://www.bioschemas.org/MolecularEntity