Could bgp password include double quotation character "?

[Eugene Qian]

Hi All,

How could I include double quotation in bgp password?

in my config file

protocol bgp AS_64496 from ABC {
  description "BIRD BGP instance AS_64496";
  multihop;
  neighbor x.y.z.3 as 65002;
  source address a.b.c.29;     # What local address we use for the TCP
connect
  password "a1s@"xyz";
  import all;
  export where proto = "static_bgp";
}

password "a1s@"xyz";

I tried to use \ to escape or use single quotation for password, the bird
will give me this error

/opt/bird/etc/bird.conf, line 30: syntax error

What is the restriction on password?

Thanks
-Eugene