Make ketamine craftable and change its metabolisation rate

[constatinus]

Wouldnt it be cool if ketamine could be craftable at chemistery, and its metabolisation rate dropped to something low, like 0.2? Now, this would be a bit op, so maybe make the recipe very complicated and yield small amounts of it? This would mean reducing the amount sleepypens get and snoozebuddies put out. Or add sodium thiopental (if im correct, that one knocks you out in 12 secs, so maybe not).