Keeping me on my toes, and confused. Sorry about that.
Guess I was right the first time, knew it, but got confused, a little dyslectic I guess.
Back to it being Alteogen....
"Merck has more recently been highlighting the convenience of three as well as six-week dosing, and for the latter use it has co-formulated Keytruda with a recombinant hyaluronidase coded MK-5180."
"A subcutaneous answer to PD-1’s patent problem" 18 August 2023