Norepinephrine is a five pitch variation to North America's most popular 5.9, Epinephrine. The last four pitches, all 5.10, stalk the brilliantly exposed arete left of the Epinephrine chimneys with a spectacularly diverse allotment of climbing - roof pulls, steep face climbing, slippery mantles and even a few splitter cracks, with just enough bolts to keep the climbing exciting, but rarely dangerous.