Here's what methylpropionate is:
* Structure: It's an ester with the formula CH3CH2COOCH3.
* Properties: It's a colorless liquid with a fruity odor. It's commonly used as a solvent and flavoring agent.
It's possible that "methylpropional" was meant to refer to methylpropanal (also known as isobutyraldehyde), which is an aldehyde with the formula (CH3)2CHCHO. This compound is also a colorless liquid with a pungent odor and is used in various industrial applications.
If you can provide more context about where you encountered the term, I might be able to give a more specific answer.