#$%^&*AU2013263791A120131219.pdf#####H:\re\tevoven\NRPo1blDCC\REC\58163_LDOC-26/I/20! Abstract The present invention relates to crystalline forms and hydrates of 2-Amino-2-[2-(4-C2 20alkylphenyl)ethyl]propane-1,3-diol, and to the use thereof, in particular in the treatment or prevention of various autoim mune conditions.