Hexamine is a crystalline solid used as a fuel in portable stoves.
The diagram shows its skeletal structure.
What is the empirical formula of hexamine?

1 )
CH$_2$N
C$_3$H$_6$N$_2$
3 )
C$_4$H$_8$N$_4$
4 )
C$_6$H$_{12}$N$_4$
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