User-agent: Googlebot
Disallow: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Disallow: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Disallow: Chrome/W.X.Y.Z Safari/537.36
Disallow: Googlebot/2.1 (+http://www.google.com/bot.html)