If i write blackslash in a command

Hey Guys! 

I would like to summon a mob with name with a procedure, so I made the following:

execute command / summon minecraft:cow ~ ~ ~ {CustomName:"\"entityname\""}

When i first tried it worked, just i noticed  blackslashes are deleting when I reopen the procedure, but now the command didn't works when i call the procedure even if i rewrite the blackslash and lock the code for mcreator

When i opened the code i saw it looks like this way:

{CustomName:\"\\\"entityname\\\"\"}