Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Skin external preparation
 The present invention provides a skin external preparation comprising a compound of the formula (1), (2), (3) or (4). ##STR1## wherein X represents COOH, etc., Z represents CONH.sub.2, etc. and R.sup.1 and R.sup.7 individually represent a hydrogen atom, etc. The above-described compound has excellent effects, for example, for preventing or alleviating skin aging or inhibiting hair growth. 
Kao Corporation
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Satoshi Shigeru Yoshinori Mikako Yasuto Yoshinori Genji Yukihiro Naoko
Kanazawa Moriwaki Nishizawa Watanabe Suzuki Takema Imokawa Ohashi Tsuji