Yes, BOTULIN is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, T 1, U 1, L 1, I 1, N 1.

Is it a valid word?

BOTULIN is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon

Also: botulinus toxin.

Not playable in Scrabble US: BOTULISMOTOXIN.