上游原料
1,4,7,10-tetraazacyclododecane; Cyclenoctahydro-5H-2a,4a,7,9a-tetraazacycloocta[cd]pentalene1,4,7,10-tetraazacyclododecane-1-carbaldehyde2-[4,10-bis(2-hydroxy-2-oxoethyl)-7-(2-hydroxypropyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic acid2-[4,10-bis(2-hydroxy-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic acidtert-butyl 2-[4,10-bis[2-(tert-butoxy)-2-oxoethyl]-7-formyl-1,4,7,10-tetraazacyclododecan-1-yl]acetate
