A solid-state NMR experiment for identifying nitrogen-bonded carbons with good efficiency at standard magic-angle-spinning (MAS) frequencies is presented. In the center of a sequence of 180degrees pulses recoupling the N-14-C-13 dipolar interaction, the N-14 coherences are saturated by a train of small-angle N-14 pulses for 1-2 ms. This saturation-pulse induced dipolar exchange with recoupling (SPIDER) provides efficient partial dephasing of C-13 bonded to N-14 at 5-kHz MAS and low radio-frequency strengths where REAPDOR and TRAPDOR are inefficient. SPIDER is demonstrated on an amide group with a N-14 quadrupole-coupling constant of -3.1 MHz, on a benzamide, and on chitin. (C) 2002 Elsevier Science B.V. All rights reserved.