1: https://d1wqtxts1xzle7.cloudfront.net/50178822/j.physbeh.200... and https://doi.org/10.1016/j.physbeh.2009.03.001
Check out the official Canadian Maple Flavour Wheel to get an idea of the various flavors at hand: https://agriculture.canada.ca/sites/default/files/legacy/res... [pdf]
I recommend to seek out producers of syrup that sell their product directly and can confirm it is unmixed - A lot of grocery-scale distributors will mix together various batches of syrup to make it more uniform at scale which largely robs you of that magical uniqueness.
If you can sample it right off the distillator at a syrup farm - holy crap, you HAVE to. Absolutely divine.
And leave the artificial high fructose syrup at the grocery store!