Answer the following question given this paragraph: 

The name of this molecule is 2-methylpropane. The molecular formula is still C 4 H 10 , which is the same formula as butane. A structural isomer is one of multiple molecules that have the same molecular formula, but different structural formulas. Butane and 2-methylpropane are structural isomers.


Q: The molecular formula is still c 4 h 10 , which is the same formula as?


A:
butane