The @ is already there. I don't know why others didn't type this instead of "at sign" or "at symbol"
In any case, you don't need to add @, just delete ANTIVIRAL.
According to Wikipedia, both at sign and at symbol are used.
The (@) amphere sign is known by various names in English, including "at sign","at the rate", "at symbol", "at mark", "commercial at" or "ampersat". This is not to be confused with the ampersand.
In Italian, the symbol is informally called the "snail" (chiocciola); its French name is "arobase" or sometimes "arrobe" or "arobe" (from the arroba, an old Spanish and Portuguese unit of weight); in Dutch it is called the "(little) monkey-tail" (apenstaartje); in Hebrew, it is informally called Strudel ("שטרודל"); in Japanese it is the "at mark", and similarly, in German it is called the "at symbol" or "spider monkey" (Klammeraffe); and in Chinese, it is known as the "little mouse".[1] In Spanish and Portuguese it is the symbol for arroba, an archaic unit of weight, and in some Spanish- and Portuguese-speaking countries it is still pronounced this way, even when related to an email address.
In Russian, the symbol is informally called the "dog" (sobaka (собака)) or "doggie" (sobachka (собачка)). The Finnish sometimes call the symbol "miukumauku" (meow meow) owing to the symbol's resemblance to a cat and its tail. In Bulgarian it is called "maimunka (маймунка)," "little monkey" and in Polish, it is called "małpa," meaning "monkey," for its resemblance to a monkey with its arm extended over its head.
In Swedish and Danish the sign is known as the "snabel-a" (literally trunk a), owning to the resemblance between the sign and the trunk of an elephant. In Norwegian the term most commonly used is "kr
