  Amide molecules produced in space could play a key role in the formation of
biomolecules on a young planetary object. However, the formation and chemical
network of amide molecules in space is not well understood. In this work, ALMA
observations are used to study a number of amide(-like) molecules toward the
high-mass star-forming region NGC 6334I. The first detections of cyanamide
(NH$_{2}$CN), acetamide (CH$_{3}$C(O)NH$_{2}$) and N-methylformamide
(CH$_{3}$NHCHO) are presented for this source. These are combined with analyses
of isocyanic acid (HNCO) and formamide (NH$_{2}$CHO) and a tentative detection
of urea (carbamide; NH$_{2}$C(O)NH$_{2}$). Abundance correlations show that
most amides are likely formed in related reactions occurring in ices on
interstellar dust grains in NGC 6334I. However, in an expanded sample of
sources, large abundance variations are seen for NH$_{2}$CN that seem to depend
on the source type, which suggests that the physical conditions within the
source heavily influence the production of this species. The rich amide
inventory of NGC 6334I strengthens the case that interstellar molecules can
contribute to the emergence of biomolecules on planets.
