AT1521

AT1521 is an experimental reagent to supress the T-Virus, developed by, among others, Linda and Carter, scientists working for the Umbrella Corporation in their offical facility in Raccoon City.

History
Developed at some point prior to or during the 1998 Outbreak that devestated Raccoon City and annihilated it's population, AT1521 is a serum designed to inhibit the growth of the virus.

As the final night of the Outbreak drew to a close, and Raccoon City's ultimate destruction grew near, the facility where the reagent was stored came under sige from within. A repidly spreading fire and escaped Hunters killed almost all of the staff. A desperate Linda returned to the lab to obtain a sample of the reagent and became trapped within the building with Carter and a group of survivors from the city. With the aid of a Tyrant, they founght off the hunters and made it to the escape elevator.

But something unexpected happened. The tyrant rebelled, killing Carter and destroying the only existing reagent sample. The desperate survivors were forced to dodge the tyrant and other perilsof the city, with an injured Linda in tow, before facing off against the bioweapon Nyx and escaping the city seconds before it's annihilation.

Later, Linda was able to re-create the sample from memory, which proved crucial to ensuring that the T-Virus outbreak in Raccoon City did not spread any further.