申请人:Chevron Research Company
公开号:US04041159A1
公开(公告)日:1977-08-09
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are alkyl and R.sup.4 is alkyl, haloalkyl or aryl.
化合物的公式为##STR1##其中R.sup.1,R.sup.2和R.sup.3是烷基,R.sup.4是烷基,卤代烷基或芳基。