Abstract: A compound having the following formula I: is disclosed. A method of preparing the compound of formula (I) is also disclosed.

Abstract: A compound having the formula (I): is disclosed. A method of preparing the compound of formula (I) is also disclosed.

Abstract: A method for preparing a collagen from a chromium-containing tanned leather waste is disclosed. The method includes acid dechromation, obtaining a collagen aggregate, and converting the collagen aggregate to the collagen. The method also includes a reaction in a supercritical carbon dioxide reactor.

Abstract: A compound having the formula (I): is disclosed. A method of preparing the compound of formula (I) is also disclosed.

Abstract: A compound having the following formula I: is disclosed. A method of preparing the compound of formula I is also disclosed.

Abstract: A gossypol eflornithine Schiff base compound having the following Formula I: is disclosed. A method of preparing the compound of Formula I is also disclosed.

Abstract: A compound having the following formula I: is disclosed. A method of preparing the compound of formula I is also disclosed.

Abstract: A compound of chemical formula I: or chemical formula II: or a pharmaceutical acceptable salt thereof is disclosed. R1, R2, R3, and R4 are independently H, halogen, nitro, hydroxyl, cyano, benzyloxy, C1-C8 straight or branched alkyl, C1-C8 straight or branched haloalkyl, C1-C8 straight or branched alkoxy.

Abstract: A compound of chemical formula I or a pharmaceutical acceptable salt thereof is disclosed. R1 is OH or OAc; X is C or N; and R2 is H, alkyl, alkoxy, benzyloxy, haloalkyl, OH, CN, NO2, or halogen, provided that when X is N, R2 is nil.

Abstract: A compound having the following formula I: In formula I, R1 and R2 are independently H, alkyl, alkoxy, and halogen. A method of preparing the compound of formula I is also disclosed.

Abstract: A compound having the formula I: is disclosed. A method of preparing the compound of formula I is also disclosed.

Abstract: A compound having the following formula I: is disclosed. A method of preparing the compound of formula I is also disclosed.

Abstract: A method of preparing an aesculin sturgeon skin gelatin with antioxidant activity and Enterococcus faecalis detection ability includes: 1) mixing a sturgeon skin gelatin and distilled water in a ratio of 1:15-1:25 (w/v) at 50-70° C. and filtering to obtain a sturgeon skin gelatin solution; 2) adding aesculin and a glycerin solution to the sturgeon skin gelatin solution, stirring the resulted sturgeon skin gelatin solution at 30-50° C. for 30 minutes, and filtering; and 3) removing air bubbles from the sturgeon skin gelatin solution of step 2) under reduced pressure, placing the sturgeon skin gelatin solution on an acrylic glass, and drying the sturgeon skin gelatin solution at in a vented oven 25° C. and 45-55% relative humidity for 24 hours to obtain the aesculin sturgeon skin gelatin film.

Abstract: Provided is a method for the preparation of a porous hollow shell WO3/WS2 nanomaterial, comprising: (1) adding a hexavalent tungsten salt to a sol A comprising mesocarbon microbeads, and stirring to obtain a sol B; (2) drying and grinding the sol B, and then heating a resulting powder at 200-500° C. for 0.5-2 hours to obtain a porous hollow shell WO3 nanocrystalline material; (3) placing the porous hollow shell WO3 nanocrystalline material obtained by Step 2 and a sulfur powder separately in a vacuum furnace, controlling such that a degree of vacuum is ?0.01 to ?0.1 MPa and a temperature is 200-500° C., and reacting for 0.5-3 hours to obtain a WO3/WS2 porous hollow shell nanocrystalline material. Also provided is a porous hollow shell WO3/WS2 nanocrystalline material obtained by the method.

Abstract: A lappaconitine aza-cinnamic acid derivative having the following formula (I): X is C or N, and R1, R2, and R3 are independently H or lower alkyl. A method of preparing the lappaconitine aza-cinnamic acid derivative of formula (I) is also disclosed.

Abstract: An isatin spiro compound having the following formula (I): R1 is halogen or C1-3 alkyl; R2 is C1-3 alkyl or benzyl; and R3 and R3? are independently H, C1-3 alkyl or phenyl.

Abstract: A hesperetin aza-cinnamic acid derivative has the following formula (I): R1 is H or alkyl, and R2 and R2 are independently H, alkyl, hydroxy, halogen, nitro, or alkoxy.

Abstract: An isatin peroxo compound has the following formula (I): R1 is H, halogen, or C1-3 alkyl, and R2, is H, C1-3 alkyl, or phenyl.

Abstract: A method of preparing a sturgeon skin gelatin with antioxidant activity includes: 1) soaking sturgeon skin in water, and sonicating the sturgeon skin; 2) cutting the sturgeon skin, soaking the sturgeon skin in a NaOH solution, and soaking the sturgeon skin in an HCl solution; 3) washing the sturgeon skin of step 2) to neutral, placing the sturgeon skin in an extraction solution for extracting sturgeon skin protein; and 4) obtaining the sturgeon skin gelatin. A method of preparing a sturgeon skin gelatin film includes: 1) dissolving sturgeon skin gelatin in water to obtain a sturgeon skin gelatin solution; 2) adding glycerine to the sturgeon skin gelatin solution; and 3) obtaining the sturgeon skin gelatin film.

Abstract: A hesperetin aza-cinnamic acid derivative has the following formula (I): R1 is H or alkyl, and R2 and R2 are independently H, alkyl, hydroxy, halogen, nitro, or alkoxy.