assistant shipping channel bridge of Harbin Songpu Bridge
main bridge of Changjiang River Bridge Shanghai
main bridge of Hemaxi Bridge
T-shaped beam bridge and hollow slab bridge
18-Crown-6
18-冠-6
18冠6
18-冠醚-6
18–冠<醚>–6
18-Crown-6-tetracarboxylic
4′-acetylaminobenzo[15]crown5