Howto Install google chrome in nixos?

How can I install google chrome in nixos? I have tried nix-env -i google-chrome nix-env -i google-chrome-stable ... Which does not seem to work. I also tried using the unstable branch nix-channel --add https://nixos.org/channels/nixpkgs-unstable nix-channel --update and then nix-env -i unstable.google-chrome-stable nix-env -i unstable.google-chrome ... However it looks like the package should exist somewhere. https://github.com/NixOS/nixpkgs/tree/master/pkgs/applications/networking/browsers/google-chrome Does anybody know what I am missing here?