natural penicillins are based on the original penicillin G structure; penicillinase-resistant penicillins, notably methicillin and oxacillin, are active even in the presence of the bacterial enzyme
One more than I can think of more than likely. Originally the bean taco,potatoe (papas), egg (huevo), and picadillo (hamburger meat) tacos were made for breakfast and lunch, then papas a huevo were...