Hexamine (Self-assembly is neat)

Hexamine is a nitrogenous analogue of adamantane.

i-d26622d9f8d68828e28f1c301ca2afe5-hexamine.png

The coolest thing about it is the exceptionally stable adamantyl-type system assembles on its own if you just mix ammonia and formaldehyde gas. It's got loads of uses, from little fuel tabs for stoves, to a component of explosive mixtures, to deodorant in China (anyone care to elaborate?)

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Ohh how I love hexamine....

the lone pair on the nitrogen in NH3 acts as a strong nucleophile towards the delta-positive carbonyl in H2CO (formaldehyde), and NH3 is acidic enough to protonate the carbonyl oxygen (so it can eliminate as water).
Cool example.