What does ethyl butanoate smell like?

Ethyl butanoate has an odor quite similar to that of pineApple.

Note to anyone who thinks it would be fun to whip up some for a science fair project: Butanoic acid, one of the compounds you'll need to make it, does not smell a DARN THING like pineApple. Instead, the best Words for describing ITS odor would include phrases like "rancid butter" and "warm vomit", and it's pervasive ... it can be readily detected by humans at concentrations of ten parts per million. Esterification is a reversible reaction (and ten ppm is pretty low), so unless you think the judges will be impressed by your "bathroom after a tiki-themed frat party" scent-in-a-vial, you might want to skip this one and instead go for something like methyl salicylate (which smells like wintergreen, but has much less offensive precursors).