HOP_OPTIONS and multiple values in docker not working

What I am trying to accomplish is add these in the docker run command: 

            --env HOP_OPTIONS=-XX:+UseParallelGC Xmx2g -Xmx30g \

I get this message:
         "docker: invalid reference format: repository name must be lowercase"

When I put the settings in quotes (tried single and double quotes to same result):  

          --env HOP_OPTIONS="-XX:+UseParallelGC Xmx2g -Xmx30g"\

I get this message: 
         "Error: Could not find or load main class Xmx2g"

And here is what was actually sent in: (notice the whole env var is single quoted)
           --env 'HOP_OPTIONS=-XX:+UseParallelGC Xmx2g -Xmx30g'
The docker command does not like the space and Hop doesn't like quotes