“Summary1.LSD was iodinated with Na125I and chloramine T, to get the radioligand [125I]LSD (125IOL) and with …-succinimide to obtain the nonradioactive compound 2-I-LSD (IOL) for comparative pharmacological studies.2.The introduction of iodine in position … of LSD leads to an increase … selectivity for 5HT2 receptors.”