Isomerengemisch aus 9-Icosyl-9-phosphabicyclo[3.3.1]nonan und 9-Icosyl-9-phosphabicyclo[4.2.1]nonan ###>Mixture of the isomers 9-icosyl-9-phosphabicyclo[3.3.1]nonane and 9-icosyl-9-phosphabicyclo[4.2.1]nonane