發送短信

數:

提供者:

CAPTCHA:

  ______     ___     _    _     ______     _____  
 /_____//   / _ \\  | |  | ||  /_   _//   / ___// 
 `____ `   / //\ \\ | |/\| ||   -| ||-    \___ \\ 
 /___//   |  ___  |||  /\  ||   _| ||_    /    // 
 `__ `    |_||  |_|||_// \_||  /_____//  /____//  
 /_//     `-`   `-` `-`   `-`  `-----`  `-----`   
 `-`

Please enter what you see:

發送短信 : Crystal structure of dimethyl (1α,2β,3α,4β,7β,8α,9β,10α) -13-isopropylidene-pentacyclo[8.2.1.14,7.02,9.0 3,8]tetradeca-5,11-diene-2,9-dicarboxylate, C21H 24O4