Field Calculator question, calculate field with text string that has quotation marks

I'm trying to auto-popluate a field that we use to hyperlink to a specific page of a pdf. I can manually type in something like the following and the hyperlink works:

R:\Site Documents\AUTOCAD-PDF\AS-BUILT DRAWINGS\A15\LINK-1550.pdf ?/A "Page=18=OpenActions"

I'd like to use field calculator to put that same text string in every feature. However, the quotation marks in the above text string are causing me problems.

I've tried to add additional quotes at the beginning and end like below but that didnt work either:
"R:\Site Documents\AUTOCAD-PDF\AS-BUILT DRAWINGS\A15\LINK-1550.pdf ?/A "Page=18=OpenActions""

Is there a way to accomplish this without typing them in manually?

Thanks.