CARNS1
CARNS1 carnosine synthase — the molecular target that 1 compounds in the wiki act on.
In one line: The enzyme that builds carnosine, your muscles' acid-sponge for hard efforts.
CARNS1 (carnosine synthase) builds carnosine, which acts as a sponge for the acid that floods your muscles during hard, sustained effort — the "burn" that forces you to stop. More carnosine means you can push through that burn longer.
Beta-alanine is the raw material this enzyme needs, which is why taking it daily for a few weeks raises muscle carnosine and improves performance in efforts lasting one to four minutes — exactly the range that makes you want to quit.