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| |  | ||  |  ___||   ____     |  ___|| \ \\ / // 
| |/\| ||  | ||__    |    \\   | ||__    \ \/ //  
|  /\  ||  | ||__    | [] ||   | ||__     \  //   
|_// \_||  |_____||  |  __//   |_____||    \//    
`-`   `-`  `-----`   |_|`-`    `-----`      `     
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Text this: A discrete 3d-4f metallacage as an efficient catalytic nanoreactor for a three-component aza-Darzens reaction