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Its ok.https://en.wikipedia.org/wiki/Caffeine
It doesnt matter if you write CH3 or H3C you can turn the molecule so its also ok to have the bigger part left or right or on top or bottom.
The nit picky response:On the left hand side, it looks like the N-CH3 bond is going to the H3 rather than the C, which is a typo.
Re-read the whole thread.