FWIW, this site identifies the color as Mushroom:

http://translate.google.com/translate?hl=en&sl=ja&u=http://www.bekkoame.ne.jp/~mtor/mbicolor.html&prev=/search%3Fq%3Dmercedes%2Binterior%2Bcolor%2Bcode%2Bis%2B265%26hl%3Den%26lr%3D%26safe%3Doff%26client%3 Dsafari%26rls%3Den