%0 Conference Article %T Study of the physical and chemical properties of dense clumps in several high-mass star-forming regions %A Pazukhin, A.. %A Zinchenko, I.. %A Trofimova, E.. %K ISM: abundances, molecules; stars: formation, massive; astrochemistry %J Modern astronomy: from the Early Universe to exoplanets and black holes %D 2024 %P 5 %I Special Astrophysical Observatory of the Russian Academy of Sciences