Delimiter issue when passing commands in BizTalk FTP send port

I am currently running into an issue with the BizTalk FTP command delimiter (;) while trying to issue FTP commands using the ‘Before Put’ field in the configuration of an FTP send port.
 
 
These are the details :
In one FTP command (which has been passed to us by our VAN/FTP provider ) I wish to set the value of parameters (sa and ra) as follows :
site parm=sa=:XXXXXXXXXX;ra=:YYYYYYYYYY
 
The semicolon (;) in front of ‘ra=:’ causes the trouble : this semicolon is being interpreted by BizTalk as a delimiter for FTP commands and as a result Biztalk sends the above mentioned command as 2 separate commands (instead of sending it as one singel command).
Do you know of a work-around that can be used in order to circumvent this delimiter issue (some kind of FTP verbatim notation, …) ?