Dear sir, We are Minh Hang I&T Co.,Ltd.- one of the biggest companies in Viet Nam dealing in Rotundin.This is COA of my Rotundin :Certificate of analysis.Requirements Results1. Specification: meet to requirement Complies2. Absortion: 150-160 Complies ( 150.8)3. Melting point: +1410C - +144 0C Complies ( +1420C)4. Specific optical rotation: - 2990 to - 3000 Complies5. Description: Meet to requirement Complies6. Moisture: Not more than 5% Complies ( 4.34%)7. Limpidity and colour: Meet to requirement Complies8. Density: Not less than 98 % of Rotundin caculated on the dried basic Complies( 94.74% -99.04%)Hope that we can have good business relationship in the very near future.Thank you very much and look forward to hearing from you soon.Yours faithfully