NML Cygni
This star is a part of the Cygnus OB2 association, which is 1.74 ± 0.2 kpc away. This is one of the nearest massive star groups to the Sun. This group includes some of the most massive and brightest stars known, including the suspected luminous blue variable Cyg OB2 #12. NML Cygni has lots of oxygen. Molecules like H2O, Silicon monoxide, carbon monoxide, hydrogen cyanide, carbon monosulfide, sulfur monoxide, sulfur dioxide and hydrogen sulfide are also in the star.