Oblon, Spivak, McClelland, Maier & Neustadt
Condensed heterocyclic derivatives and herbicides
 A condensed heterocyclic derivative having the formula: ##STR1## wherein X is an oxygen atom or a sulfur atom; and Z is ##STR2## 
Nissan Chemical Industries, Ltd.
A C
A01N C07D
inventional inventional
Kaoru Shigeoni Tsutomu Jun Takashi Koichi Kenzou
Itoh Watanabe Nawamaki Satow Ikai Suzuki Fukuda