How to create a new Date format - GROK

Hi There,
Unfortunately I don't find timestamp pattern fits to my log:

2018 Aug 04 04:27:49.756 BLA BLA BLA...

So far I using the following pattern to handle this part:

%{YEAR} %{MONTH} %{MONTHDAY} %{TIME}

It does not help me that much.

My question is, how can I put all these parts under one field?
Thanks,

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