Chemical name, CAS number, molecular formula, structural formula and relative molecular mass Chemical name L-rhamnose CAS number 10030-85-0 Molecular formula C6H12O5·H2O Structural formula Relative molecular weight 182.17 (according to the 2018 international relative atomic mass) Technical requirements Sensory requirements Color status Physical and chemical indicators Moisture, w/% L-rhamnose content (on a dry basis)/% Melting point/°C Specific rotation (20°C) Heavy metals (as Pb)/(mg/kg) Total arsenic (as As) /(mg/kg) Microbial indicator total number of colonies/(CFU/g) Escherichia coli/(CFU/g) Salmonella/25g