What is this?
>>8077623
>not recognizing caffeine on site
>>8077623
really? you couldnt google it or something?
its caffeine
>>8077650
Its an arbitrary group
>>8077650
Zirconium without the r
>>8077623
C8H9O2N4 --->google it ---> ????
>>8077625
Caffeine doesn't have iodine in it
>>8077895
Neither does OP's picture. What's your point?
>>8077650
>>8077895
clever
>>8077623
It looks like a piece of paper printed with black ink.