1000 µg = 1 mg = 0.001 g

rambutan 250 g**
protein 3 g
fat 1 g
carbs 38 g
vitamin B1 15 µg
vitamin B2 150 µg
vitamin B3 1 mg
vitamin C 8 mg
calcium 50 mg
phosphorus 38 mg
potassium 160 mg
sodium 3 mg
iron 5 mg

** Souci, Fachmann, Kraut;
Food Composition And Nutrition Tables
Medpharm Scientific Publishers Stuttgart