Thiomorpholine123-90-0100 % similar Thiazolidine504-78-960 % similar Piperazine110-85-042 % similar Aziridine151-56-442 % similar Cyclen294-90-642 % similar Thiirane420-12-242 % similar 1,4,7-Triazacyclononane4730-54-542 % similar 1,4-Dithiane505-29-342 % similar Polyethylenimine9002-98-642 % similar Tetrahydrothiophene110-01-036 % similar Pyrrolidine123-75-136 % similar Thietane287-27-436 % similar Azetidine503-29-736 % similar Cyclen tetrahydrochloride10045-25-733 % similar Piperidine110-89-433 % similar Azepane111-49-933 % similar Azocane1121-92-233 % similar Arpezine142-63-233 % similar Piperazine hydrochloride142-64-333 % similar 1,4,8,12-Tetraazacyclopentadecane15439-16-433 % similar