Title: Complex organic molecules around low- and high-mass protostars

Abstract: Planet cores are thought to start forming around protostars where many complex organic molecules are detected. Therefore, understanding the chemistry of these species helps us understand the chemistry of the forming planets. There are already high-sensitivity studies of complex chemistry toward single sources. However, a high-sensitivity statistical analysis of complex organics toward low- and high-mass protostars is missing. I will show results from observations of these species around ~40 high-mass protostars. Moreover, I will discuss how physical conditions can affect the observations of complex organics and our interpretation of the chemistry using radiative transfer models.