Category Nuances for crown_ether:

• appropriate,
• structural,
• pendant,
• neutral,
• organized,
• benign,
• necessary,
• active,
• external,
• synthetic,
• cyclic,
• inexpensive,
• functional,

Simple Categories for crown_ether:

• ether,
• group,
• system,
• entity,
• catalyst,
• carrier,
• compound,
• ligand,
• medium,
• unit,