Standard Solution for TLC, ISO 12228 2 Analytes, each concentration as listed in acetone; unit: 1x1mL 2900.27 Cholesterol 1mg/mL 1583.30 Betulin 5mg/mL Silylating agent 3916.8-1ML N-methyl-N-(trimethylsilyl)-heptafluorobutyramide (M