Certain novel N-acylated spiropiperidine derivatives are ligands of the human melanocortin receptor(s) and, in particular, are selective ligands of the human melanocortin-4 receptor (MC-4R).

某些新型N-酰化螺哌啶衍生物是人黑皮质素受体的配体和尤其是人 黑皮质素-4受体（MC-4R）的选择性配体。

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So in a 4 page novel how many words would you expect to find ending in "ing" and in 4 pages of a novel how many words would you expect to find that include the letter "n"?

在4页的小说中,有多少词会以ing结尾呢“,在这4页中有多少,会包括n字母的词呢？

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A novel metal chromium containing organic monomer, N vinylcarbazole chromium tricarbonyl has been synthesized and the structure has been confirmed by elemental analysis, IR and 1H NMR spectra.

合成一种新的金属铬有机单体N -乙烯基咔唑三羰基铬，经元素分析、 IR和1H NMR确证和表征。

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