The NH compound is a highly reactive molecule which exists in the forms 14NH and 15NH: one nitrogen atom whose nucleus has 7 or 8 neutrons + one hydrogen atom. This is a key species and its 14NH form has been detected in our atmosphere and also in space, for example, in stellar atmospheres or around comets...
http://www.synchrotron-soleil.fr/Soleil/ToutesActualites/2012/15NH-AILES