Sherlock Holmes wrote:

It was an amphetamine molecule. 

It doesn't contain enough carbon, nitrogen, oxygen or indeed hydrogen to be an amphetamine.

And the inclusion of einsteinium would unstabilise the molecule quite a bit.

It was the capital 'E' which stopped me from trying to deduce what it could be - but an amphetamine was not in my sights.

Glad to be back

-m0r