Crystallization and preliminary X‐ray analysis of the antimalarial and cytotoxic alkaloid cryptolepine complexed with the DNA fragment d(CCTAGG) 2

Crystals of the indoloquinoline alkaloid cryptolepine complexed with the DNA fragment d(CCTAGG) 2 have been grown by the hanging‐drop technique at 293 K using ammonium sulfate as the precipitating agent. Over a period of three weeks, yellow tapering bullet‐shaped crystals grew to maximum dimensions of 0.2 × 0.1 × 0.1 mm. The crystals belong to space group P 6 4 , with unit‐cell parameters a  =  b  = 29.960, c  = 39.64 Å, α = β = 90, γ = 120°, and diffract to 1.4 Å.