Novel tetrazaporphins

Novel thermosetting resin and a process for producing same

Novel thermosetting resin composition and cured product therefro

Novel thiazole derivatives

Novel thiophene-acetic acids

Novel transient acyl derivatives of phenylbutazone

Novel triarylmethane compounds

Novel triarylmethane compounds

Novel triarylmethane compounds

Novel tributyl (2,5-dihydroxyphenyl)phosphonium hydroxide inner

Novel trifunctional aromatic amines

Novel trimethyltetraorganotin compounds

Novel type of oxa- and thia-steroids

Novel urethane polythiols

Novel urethane polythiols

Novel urethane polythiols

Novel vinyl-stannyl derivatives

Novel vitamin D.sub.3 derivative and process for preparing the s

Novel vitamin D.sub.3 derivatives and process for producing the

Novel xanthene dye developers