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molecularWeight

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
This is the molecular weight of the entity being described, not of the parent. Units should be included in the form '<Number> <unit>', for example '12 amu' or as '<QuantitativeValue>.
Values expected to be one of these types
QuantitativeValue
Text
Used on these types
MolecularEntity

Source

http://www.bioschemas.org/MolecularEntity