Sigma-Aldrich
Raschig rings
拉西环
Real Crystal® IR sample cards
Real Crystal® 红外样品卡片
Rigid PTFE sleeve
Round-bottom flask
Schlenk reaction and storage tube
Single-bulb ball-tube
Stainless steel 304 syringe needle
Stankovic transfer adapter
4-Aminoresorcinol hydrochloride
4-氨基间苯二酚 盐酸盐