 Prior to his 2010 health issues, Shulgin had been working on a series of N-allylated tryptamines including 5-MeO-DALT and 5-MeO-MALT.Shulgin spent most of his later life at the Farm in Lafayette, California.On April 8, 2008, at the age of 82, he underwent surgery to replace a defective aortic valve.