<prompt> Passage: Isomers e na le mehuta ya go fapana ya kalafi ya tlhago; mohlala, go bewa ga dihlopha tša methyl. Ka xanthines tše di emetšwego, theobromine, e hwetšwa ka tšhokolete, ke vasodilator ka ditlamorago tše dingwe tša go swana le caffeine; eupša, ge e le gore ye nngwe ya dihlopha tše pedi tša methyl e hudugile go ya boemong bjo bo fapanego ka gare ga megala e mebedi, isomer ke theophylline, yeo e nago le ditlamorago tša go fapafapana, go akaretšwa bronchodilation le anti-inflammatory action. Mohlala o mongwe wa se o tšwelela ka phenethylamine-based stimulant drugs. Phentermine ke non-chiral compound e na le ditlamorago tše fokolago go feta tša amphetamine. E šomišwa bjalo ka sehlare sa go fokotša kganyogo ya dijo gomme e na le goba ga e na ditlamorago tša go fokotša kganyogo ya dijo. Le ge go le bjalo, e fana ka thulaganyo ya athomo ya go fapana ya dextromethomethamphetamine, yeo e lego maatla go feta  <response>: theobromine 