escaping special characters in import csv file

-- HikaShop version -- : 2.2.2
-- Joomla version -- : 2.5
-- PHP version -- : 5.5.3

Hi,

I haven't found any description about how to escape special characters in the import CSV file.
I found that comma must be just escaped by a backslash: \,
But how to do with the double quote?

Here is an example for the import file content:

category, product_code, product_name, product_description
"cat1", "001", "prod1", "descr1 Blah blah\, blah blah blah \"blah blah\". descr1 end"
"cat1", "002", "prod2", "descr2 Blah blah\, blah blah blah \"blah blah\". descr2 end"

In case of an import like the above I always get the next message:
The line '"cat1", "001", "prod1", "descr1 Blah blah\, blah blah blah \"blah blah\". descr1 end"' could not be imported
The line '"cat1", "002", "prod2", "descr2 Blah blah\, blah blah blah \"blah blah\". descr2 end"' could not be imported

How should I import texts including double quotes. And including other specal characters?

Thanks .

Thank you!