1-tert-butyl-4-prop-2-enyltetrazol-5-one

1-but-3-enyl-4-tert-butyltetrazol-5-one

1-tert-butyl-4-pent-4-enyltetrazol-5-one

1-tert-butyl-3-prop-2-enylurea

1-tert-butyl-3-(2-methylprop-2-enyl)urea