laboratory frame bilinear analog these sequences are useful not only in 13 c nmr in solution state but also 29 si mas nmr in the solid state and the nmr of spin 1 systems in ordered phases an u2018 anti phase u2019 version of the experiment is also pointed out more specifically this document proposes u2014 and demonstrates for 13 c at natural abundance u2014 a family of new pulse sequences to achieve the maximum sensitivity as predicted by the relevant unitary bound 9 while also achieving a diagonal suppressed cosy display with transition selectivity f1 spectral widths are now governed by the normal single quantum spectral window resulting in superior resolution furthermore since it is single quantum coherence sqc that evolves during t 1 and not dqc relaxation losses may be expected to be typically lower per unit time as also the single quantum linewidths the inventive approach is based on employing a double quantum filter to discriminate against uncoupled spins followed by conversion to single quantum coherence with transition selectivity i e conversion to a single transition at each of the chemical shifts of the two coupled spins evolution of the set of single transitions then follows terminated by a zero quantum mixing hamiltonian followed by signal detection echo or anti echo selection is governed by the addition or not of a u03c0 pulse just before right after mixing addition of the said pulse results not only in echo pathway selection but also the selection of different multiplet components in f1 and in f2 e g.