The large family of detected interstellar cyanide compounds
was expanded again in 2015 with the disovery of n-propyl cyanide (n-C3N7CN) by
Belloche et al. The
anti conformer of the compound was detected toward
Sgr B2(N) on the basis of 50 unblended transitions,
with no missing lines; the gauche conformer
was not detected. Likewise, neither form of n-propyl cyanide was detected toward the adjacent source Sgr B2(M).
The observed lines were part of an extensive survey made with the IRAM
30m telescope. Subsequent experimental work by
Müller et al. characterized
transitions of vibrationally excited n-propyl cyanide and led to its detection in Sgr B2(N).