Sigma-Aldrich
2-Hydroxyethyl cellulose
2-羟乙基纤维素
2,4-Diaminopyrimidine
2,4-二氨基嘧啶
Pinch clamps for SJ joints
PTFE stirrer guides
PTFE syringe tubing
PTFE 注射器管
Quickfit® ground-glass stoppers
Quickfit® jacketed coil condenser
Quickfit® separating funnels
Quickfit® Soxhlet extractor body
Quickfit® three-neck round-bottom flasks with vertical necks
Reaction and storage flask, Kjeldahl, with glass stopcock on side-arm
Real Crystal® IR sample cards
Real Crystal® 红外样品卡片
Rigid PTFE sleeve