I think it's what it's officially called in the Alien Universe
"Chemical A0-3959X.91–15, i.e. 42-(acetyloxy)-1-7-0-1-unobtaini-interferon acid, also known as "black goo", sold under brand name EcoCola, marketed as alternative to NukaCola, is an nano-engineered chemical first documented in report A0-3959X, ..."
Or something.