from the label it sounds like it's a 50/50 mix of DAP and Urea (not ideal), but assuming it has no fillers it's probably 100% YAN, so however many milligrams a teaspoon weighs is how much YAN you're adding per gallon. Guessing a teaspoon comes out to around a gram or so since there's about 4L in a gallon. If you've already added a teaspoon at the beginning of fermentation you're probably fine, they probably got really excited from the DAP and got a little hot and started cranking out esters like ethyl acetate. as long as the ferment doesn't stall it should be ok.

in the future i would avoid using any nutrient that contains urea, didn't know they actually still made them. this stuff sounds pretty similar to fermaid k and is only $13/lb

https://www.amazon.com/BSG-849731002187-Fermax-Yeast-Nutrient/dp/B0064H0MWY/

for the "1.0-1.5tsp/gal" i would split that up to 0.75tsp/gal in your yeast slurry at pitching with maybe some goferm if you're feeling fancy (https://www.amazon.com/Go-Ferm-Nutrient-1-oz/dp/B06XPMLJ9W/) and then do the other 0.75tsp/gal like 3 days in or so. that will keep them happy without them going apeshit and making weird smells